Seattle burned on 6 June 1889 and rebuilt its business district a storey or two higher, to be done with the tide that kept pushing the sewers back up Elliott Bay. The buildings went up before the streets did, so their ground floors and the old wooden sidewalks ended up beneath the new roadway. Two private companies walk visitors through those spaces in Pioneer Square today – not a buried city, but basements, sunken shopfronts and covered sidewalks, with the tour surfacing several times in between. This page gives the September 2026 prices in dollars, including the sales tax that is missing from most listings, and sorts out which company runs what.
- TicketsThe two companies work in opposite ways, and one of them hides a price.
- Price$30.00 – Bill Speidel's Underground Tour, adults
- OpenBill Speidel's Underground Tour: daily all year, tours on the hour from 10 am to 6 pm, which is nine departures a day.
- Best timeWeekday mornings.
- ClaustrophobiaThese are basements under sidewalks, not tubes – low, but not pressing in on you.
Tickets and prices
The two companies work in opposite ways, and one of them hides a price. Beneath the Streets advertises $26.00 for an adult, then adds 15.35% sales and admission tax at checkout, so the actual charge is $29.99 – and resellers such as AAA TripCanvas and Viator list the same hour from $32 with taxes and fees still to be calculated. Bill Speidel's charges $30.00 all in. For booking: Bill Speidel's sells online and by phone until two hours before a departure, after which everything goes over the counter at 614 First Avenue, first come, first served. Beneath the Streets caps each tour at 25 people and says itself that tours sell out, so that one is worth booking days ahead rather than hours.
Official prices
- Bill Speidel's Underground Tour, adults$30.00
- Bill Speidel's, seniors, students and military with ID$27.00
- Bill Speidel's, youth aged 7 and over$20.00
- Bill Speidel's, children aged 6 and under$10.00
- Bill Speidel's Underworld Tour, evenings, 21 and over, cocktail included$42.76
- Beneath the Streets, adults – advertised at $26.00 plus 15.35% sales and admission tax$29.99 at the till
- Beneath the Streets, seniors 60 and over, educators and military with ID, $23.00 plus tax$26.53
- Beneath the Streets, students aged 13 to 17 or with a college ID, $23.00 plus tax$26.53
- Beneath the Streets, children aged 7 to 12, $16.00 plus tax$18.46
- Beneath the Streets, toddlers aged 2 to 6, $5.00 plus tax$5.77
- Beneath the Streets, After Hours Red Light District Tour and Underground Queer History Tour, both 18 and over, $28.00 plus tax$32.30
- Beneath the Streets, private tour for up to 15 people, $270.00 plus tax – $320.00 for 16 to 30 people, from $210.00 for schools and non-profits, $50.00 surcharge before 10 am or after 5 pm$311.45
- Klondike Gold Rush National Historical Park, the museum two blocks away, entirely above groundfree
- Link light rail, single fare by distance, and the day passabout $2.25 to $3.50, day pass $8.00
As of 09/2026 · source and direct booking: undergroundtour.com
When everything is sold out
At Bill Speidel's a full tour usually means waiting an hour rather than missing out – and between June and September only half an hour, because extra departures run on the half hour then, sold at the ticket booth and invisible online. At Beneath the Streets sold out often means nothing else that day. If both are full, the free Klondike Gold Rush National Historical Park two blocks away covers much of the same ground at street level.
Underground tours in Pioneer Square
Booking direct is normally the cheaper route here: Bill Speidel's charges $30.00 all in and Beneath the Streets $29.99 once its 15.35 per cent tax is added, while resellers list the same hour from $32 with taxes and fees still to be calculated. The senior, student, educator and military rates exist only on the operators' own checkouts. A reseller earns its keep when Beneath the Streets is sold out on the day you want, when you need free cancellation up to 24 hours ahead, or when the underground hour comes bundled with the rest of a Pioneer Square walk. Read the description before you book: several Seattle listings sold under the word underground are street-level walking tours that never go below the sidewalk.
Seattle: Guided Underground Walking Tour
Booked through GetYourGuide (affiliate link, advertising). Most offers can be cancelled free of charge up to 24 hours ahead. Prices as of 20 September 2026.
Opening hours and best time
Bill Speidel's Underground Tour: daily all year, tours on the hour from 10 am to 6 pm, which is nine departures a day. From June to September extra tours run every half hour between 10:30 am and 5:30 pm – these are sold at the ticket booth only and never appear online. Closed on Thanksgiving Day and Christmas Day; short hours on 24 December, 10 am to 1 pm. Beneath the Streets: daily, tours between 10 am and 5 pm with doors from 9:45 am, plus evening departures at 6:30 pm on selected weekends. As of 09/2026.
When it is quietest
Weekday mornings. The 10 am departure is the quietest at both companies, and at Bill Speidel's the size of the group shapes the hour more than the guide's script does. From June to September Bill Speidel's adds departures every half hour, so the wait never exceeds 30 minutes – but you go down with considerably more people. Beneath the Streets should be booked several days ahead in high season. And because so much of the time is spent at street level, neither tour is a full wet-weather substitute: in steady rain you walk through Pioneer Square in the rain.
Who it suits
With children
Allowed, but not sensible at every age. Beneath the Streets says outright that an hour of history can be hard going for under-sevens, and requires one paying adult for every three children under 12. Realistically it works from about eight to ten years old.
Minimum age
None for the daytime tours. The evening tours are strict: Bill Speidel's Underworld Tour is 21 and over with photo ID, because a cocktail is included; the Beneath the Streets After Hours and Underground Queer History tours are 18 and over.
Wheelchair
Not possible at either company. Beneath the Streets counts six flights of stairs with no elevator, and its own ticket office sits below street level down an outside stair. Bill Speidel's names flights of stairs, uneven terrain and spotty lighting. Neither can be retrofitted: Pioneer Square is a preservation district and the spaces are protected. The step-free alternative is the free Klondike Gold Rush National Historical Park.
Pushchair
A stroller can be left at the Beneath the Streets office during the tour or carried; it cannot be pushed down six flights of stairs.
Dogs
Certified service animals only. Beneath the Streets puts this down to the terms of its lease.
Claustrophobia
These are basements under sidewalks, not tubes – low, but not pressing in on you. What makes it uncomfortable is the dark and the crowd: 30 to over 40 people on a Bill Speidel's tour is normal, while Beneath the Streets stops at 25.
What to wear
Flat shoes with grip that you do not mind getting dusty – the operator says plainly to leave the heels at home. It is cool and damp below, so pack a layer even in August. You spend a good part of the tour outdoors, so in Seattle weather bring a rain jacket rather than an umbrella.
Photography
Photography is allowed and normal at both companies. The lighting is weak and patchy, so a fast lens or a steady hand helps. There are no restrooms anywhere on either route.
Getting there
By public transport
The Pioneer Square light rail station sits under 3rd Avenue at James Street and is served by both the 1 Line and the 2 Line; both meeting points are a few minutes' walk from the exits. From Sea-Tac Airport the 1 Line runs downtown without a change in a little over half an hour. Fares are distance-based, roughly $2.25 to $3.50 one way, with a day pass at $8.00; pay with an ORCA card or at the platform machines. Worth knowing as you arrive: that platform lies 59 to 69 feet, 18 to 21 m, below the street – deeper than anything either underground tour will show you.
By car
Pioneer Square has metered street parking and garages, but neither company has visitor parking, and Bill Speidel's simply points visitors at a parking search for the neighbourhood. Beneath the Streets advises buying at least 90 minutes at the meter – an hour of tour plus a cushion. Driving in only makes sense if you are coming from outside the city anyway.
From the nearest city
From Pike Place Market it is about a 15-minute walk south, from the Colman Dock ferry terminal less than five. King Street Station, where Amtrak calls, is a short walk to the south-east. Doing both tours in one morning is realistic: a little over two hours fifteen for the pair.
Tips for your visit
- In summer, do not trust the online calendar. From June to September Bill Speidel's runs extra tours every half hour between 10:30 am and 5:30 pm, sold only at the booth at 614 First Avenue. If the website shows nothing, you can still be underground within half an hour.
- Beneath the Streets is the opposite case: 25 seats per tour and the company itself warns that they sell out. If that is the tour you want, book days ahead.
- Add the tax before you compare. The $26.00 at Beneath the Streets is pre-tax; 15.35% brings it to $29.99, which is effectively level with the $30.00 at Bill Speidel's.
- Buy direct. Resellers list the same Beneath the Streets hour from $32 with taxes and fees still to come, and senior, educator, student and military rates exist only on the operators' own checkouts.
- Both tours in one day is not a repeat. The two companies hold different basements, so you see different rooms. Together it comes to a little over two hours fifteen.
- There are no restrooms on either route, and none underground at all. Go beforehand.
- Flat shoes with grip that can get dusty. The floor is uneven, and the darkest stretches have the worst footing.
- The violet glass prisms in the Pioneer Square sidewalks are the skylights of the buried walkways – the free part of the story, and five minutes is enough for it before or after the tour.
- Pioneer Square is Seattle's oldest neighbourhood and also a visible centre of homelessness and street drug use. Both meeting points sit inside it and the above-ground stretches lead through it. This is the single commonest reason for bad reviews – not a reason to skip the tour, but better known in advance.
- If stairs are out of the question, the Klondike Gold Rush National Historical Park two blocks away tells much of the same story, free and at street level.
What the internet gets wrong
The $26.00 is a pre-tax figure. Beneath the Streets adds 15.35% sales and admission tax at the till, which makes $29.99 for an adult, and the resellers sit above both. That one line of tax is the whole reason the same 60-minute tour appears online at anything between $26 and $32.
As of September 2026 Bill Speidel's charges $30.00 for adults, $27.00 for seniors, students and military with ID, $20.00 for youth aged 7 and over and $10.00 for children of 6 and under. Tours run on the hour from 10 am to 6 pm all year, not 9 to 7.
Nobody goes free at either company. Bill Speidel's charges $10.00 for children of 6 and under, and at Beneath the Streets a toddler of 2 to 6 costs $5.00 plus 15.35% tax, which is $5.77 at the till.
What survives are areaways – the old sidewalks, sunken shopfronts and ground-floor rooms beneath the modern roadway, lit through glass prisms set into the pavement. English Wikipedia defines the Seattle Underground in exactly those terms. There are no continuous streets down there, and each tour visits three separate stretches.
The 25 to 30 blocks are what the 1889 fire destroyed, not what you can walk. Bill Speidel's covers about three blocks and Beneath the Streets four, and Beneath the Streets puts its entire route at roughly half a mile, 0.8 km – street-level walking included. Both tours descend three times and come back up in between, so about half the hour is spent above ground.
This is not settled. English Wikipedia gives fear of bubonic plague; other accounts name typhoid carried by rats, and Seattle's documented typhoid outbreak came later, reported by health officials on 12 September 1909. No contemporary source could be checked for this page, so the reason is left open here rather than picked. The date and the fact that the rooms kept being used afterwards are not in doubt.
The chronology does not work. The spaces were produced by the street raising of 1889 to 1892 and condemned in 1907, while Washington State only went dry on 1 January 1916 and national Prohibition began in 1920. They were never dug as tunnels either – they are the sidewalks and ground floors of an existing neighbourhood with a roof put over them. Speakeasies were one later use among several.
No such figure appears at either operator or at HistoryLink, and the areaways were never housing. After 1907 the rooms were used – flophouses, gambling rooms, speakeasies, opium dens – but no count of permanent residents exists. Any population number you see for the Seattle Underground is somebody's invention.
True of Beneath the Streets, wrong for Bill Speidel's. There, online and phone sales close two hours before a departure and everything after that goes over the counter at 614 First Avenue, first come, first served – and from June to September the company adds departures every half hour between 10:30 am and 5:30 pm that are sold at the booth only and never appear online. An online calendar with nothing left does not mean the tour is full.
History in brief
- Seattle grew from the 1850s almost at sea level on Elliott Bay. At high tide the sewers ran backwards and the original street level stayed chronically wet – the problem was well understood long before the fire.
- On 6 June 1889, at about 2:20 pm, a glue pot boiled over in a cabinet shop near Front Street, today's First Avenue. The fire took roughly 25 to 30 blocks of the business district and the waterfront. The privately owned water supply collapsed, and when crews went to draw from Puget Sound the tide was out.
- The rebuild became the chance to raise the streets. Retaining walls went up on both sides – eight feet and more, the operator says – the gap between was filled and a new surface laid on top. Depending on the street the level rose by 10 to 35 feet, about 3 to 10.7 m; HistoryLink puts the record at 3rd Avenue South by Jackson Street. The work ran from 1889 to 1892.
- The buildings were finished before the streets were. For years pedestrians walked at the old level and climbed ladders to cross a road, and shops kept two entrances, one below and one above.
- When the sidewalks were finally roofed over, the areaways were created: the old walkways and ground floors, now under the roadway. Glass prisms were set into the new pavement to let light down, and those panes – turned violet by a century of sun – still lie in Pioneer Square and cost nothing to look at.
- In 1907 the city condemned the underground spaces. Fear of bubonic plague is the reason usually given, typhoid carried by rats the competing one; either way the rooms carried on being used, as flophouses, gambling rooms, speakeasies and opium dens.
- On 3 August 1964 a Seattle Times column invited readers to write to the journalist Bill Speidel if they wanted to see the buried shopfronts. About 300 letters arrived within two days. The first organised tour ran in May 1965: 500 people in a single day, a dollar a head.
- The tours turned Pioneer Square into a public cause and saved the district from being cleared for parking garages – around 100,000 signatures, then designation as a historic district. After Speidel's death in 1988 his daughter Sunny Speidel took over the business; in 2013 Beneath the Streets arrived as a second operator with passages of its own.
Frequent questions
How much does the Seattle Underground Tour cost in 2026?
At Bill Speidel's, $30.00 for adults, $27.00 for seniors, students and military with ID, $20.00 for youth from 7 and $10.00 for children of 6 and under. Beneath the Streets advertises $26.00 for adults but adds 15.35% sales and admission tax at checkout, so you pay $29.99. Resellers list that same tour from $32 with taxes and fees still to be added. As of September 2026.
Why do I see different prices for the same Seattle underground tour?
Because Beneath the Streets quotes its prices before tax. The 15.35% sales and admission tax is added at the till, turning $26.00 into $29.99, and third-party sellers add their own margin on top, which is where the $32 listings come from. Bill Speidel's quotes $30.00 all in, so the two tours cost within a dollar of each other once the tax is counted.
Which underground tour is better, Bill Speidel's or Beneath the Streets?
Bill Speidel's is the older, louder, bigger one: 75 minutes, comedic, nine departures a day, usually doable without booking. Beneath the Streets runs 60 minutes, caps each tour at 25 people, tells it straight and needs booking. The two companies hold different basements, so doing both in one day is not a repeat – it is about two and a quarter hours for the pair.
Do I need to book the Seattle Underground Tour in advance?
For Beneath the Streets, yes – 25 seats per departure and the company says they sell out. For Bill Speidel's, usually not: nine tours a day, online sales until two hours before, then walk-up sales at the booth until a tour starts. From June to September there are also extra departures every half hour that are sold at the booth only and never show online, so a full website is not a full tour.
How long is the tour, and how much of it is actually underground?
Bill Speidel's runs 75 minutes, Beneath the Streets 60. Only about half of that is below street level: both tours descend three times and walk through Pioneer Square in between. Beneath the Streets puts its whole route at roughly half a mile, 0.8 km, across four blocks – street-level walking included. If you are expecting a continuous tunnel, this is not it.
Can you visit the Seattle Underground without a tour?
No. Every accessible section belongs to one of the two private companies, which hold their own access rights to the basements and sidewalk chambers; there is no self-guided route and no walk-in entrance. What you can see for free is the surface evidence: the violet glass prisms set into the Pioneer Square sidewalks, which are the skylights of the buried walkways.
Is the Seattle Underground a museum, or is it run by the city?
Neither. Both tours are commercial businesses with their own access to their own spaces – Bill Speidel's since 1965, Beneath the Streets since 2013. No city department and no museum operates the underground. The only public institution on the subject is the Klondike Gold Rush National Historical Park at 319 Second Avenue South, which is free, tells the Gold Rush story and is entirely above ground.
Is the Seattle Underground Tour wheelchair accessible?
No, at neither company. Beneath the Streets counts six flights of stairs with no elevator, and even its ticket office sits below street level down an outside stair. Bill Speidel's names flights of stairs, uneven terrain and spotty lighting. Pioneer Square is a preservation district, so the spaces cannot be retrofitted. The step-free alternative is the free Klondike Gold Rush National Historical Park two blocks away.
How many steps are there?
Beneath the Streets gives six flights of stairs and no elevator; Bill Speidel's only says flights of stairs. Neither publishes an actual step count, so any exact number you read online is a guess. The same goes for the length of the underground sections in feet – the companies give blocks and passages, not measurements.
How deep is the Seattle Underground?
Shallower than people expect. Roughly 20 feet, a good 6 m, of modern city sits over the old street level in Pioneer Square, and even that is an order of magnitude rather than an operator figure. What is documented is the raising itself: 10 to 35 feet, 3.0 to 10.7 m, depending on the street, with the record at 3rd Avenue South and Jackson Street. For comparison, the Pioneer Square light rail platform lies 59 to 69 feet down.
Is the Seattle Underground Tour worth it?
If you like city history and can accept that this is about basements and buried sidewalks rather than a sunken city, yes – a town that answered a fire by rebuilding itself one storey higher is an unusual story. If stairs, darkness or large groups put you off, keep the $30.00 and spend the hour in the free Klondike Gold Rush National Historical Park two blocks away instead.
How do I get there from Sea-Tac Airport?
Take the Link light rail 1 Line, which runs from the airport into downtown without a change in a little over half an hour, and get off at Pioneer Square, under 3rd Avenue at James Street. Fares are distance-based, roughly $2.25 to $3.50, and a day pass is $8.00. Both meeting points are a few minutes' walk from the station exits.
Is the tour suitable for kids, and from what age?
Children are allowed on both daytime tours, but it works from about eight to ten years old. Beneath the Streets says plainly that an hour of history can overwhelm younger children, and requires one paying adult for every three children under 12. Darkness, stairs and a lot of standing make it long going for small children. Nobody goes free: expect $10.00 at Bill Speidel's and $5.77 at Beneath the Streets for the youngest tickets.
What should I wear, and how cold is it down there?
Flat shoes with grip that can get dusty – the operator says to leave the heels at home. Neither company publishes a temperature; they only describe the air as cool and damp, so bring a layer even in August. Because a large part of the tour is outdoors, a rain jacket matters more than you would think for something billed as underground.
Does the Seattle CityPASS or any city pass include the Underground Tour?
No. Neither underground tour is covered by any Seattle sightseeing pass, including CityPASS and the C3 pass. Both companies sell only through their own checkouts and through resellers, and the discounted senior, educator, student and military rates exist only when you book direct.
Are there evening or adults-only tours?
Three of them. Bill Speidel's Underworld Tour is 21 and over with photo ID, covers the old red-light district and includes a cocktail; it is not listed on the company's website and is booked by phone or at the ticket shop. Beneath the Streets runs the After Hours Red Light District Tour and the Underground Queer History Tour, both 18 and over and 75 minutes, at $28.00 plus tax, which is $32.30.
Do you tip the guide?
Both tours are regular paid tours, not free walking tours, and neither company asks for tips on its website – the guide's pay is not built on them. Tipping guides is nevertheless common in the United States, so if the hour was good, hand it to the guide directly at the end.
Sources
Show 32 sources – every figure on this page is sourced
- undergroundtour.com/ – 75-minute duration, tours on the hour 10 am to 6 pm all year, extra half-hourly tours June to September sold at the box office only, holiday hours, address 614 First Avenue
- undergroundtour.com/what-to-expect/ – Flights of stairs, uneven terrain and spotty lighting, advice to leave the heels at home, online booking until two hours before, first come first served at the booth, closed Thanksgiving and Christmas, parking search for the neighbourhood
- undergroundtour.com/history/ – Fire of 6 June 1889, about 25 blocks destroyed, retaining walls of eight feet and more, spaces up to 35 feet, first tour in May 1965 with 500 people at a dollar each, the campaign that saved Pioneer Square
- undergroundtour.com/groups/ – Private tours for groups larger than 10 adults, booked by phone
- www.beneath-the-streets.com/ – Tour overview, durations of 60 and 75 minutes, start times, age limits, address 102 Cherry Street
- www.beneath-the-streets.com/buy-tickets-1 – Price tiers of $26, $23, $23, $16 and $5, the 15.35% sales and admission tax added at checkout, daytime tours 10 am to 5 pm with doors at 9:45, After Hours at $28 for 18 and over, the Queer History Tour, one paying adult per three children under 12
- www.beneath-the-streets.com/faqs – Six flights of stairs with no elevator, not ADA accessible, strollers, service animals only, private tours from $270, advice to buy 90 minutes of parking, not a ghost tour, founded 2013
- www.beneath-the-streets.com/about – Four blocks and three underground passages from the 1890s, maximum 25 people, subjects covered, the neighbourhood shown from both street levels
- www.beneath-the-streets.com/private-tours – Private tours: $270 for up to 15 people, $320 for 16 to 30, from $210 for schools and non-profits, $50 surcharge before 10 am and after 5 pm, each plus 15.35% tax
- en.wikipedia.org/wiki/Seattle_Underground – Definition as areaways, former sidewalks and basements; fire of 6 June 1889 at about 2:20 pm; condemnation in 1907 over fear of bubonic plague; later uses; second operator since 2013
- www.historylink.org/File/8912 – Street level around Yesler Way and to the south raised by one to 35 feet, highest value at 3rd Avenue South and Jackson Street; 500 participants in May 1965; 100,000 signatures; historic district in May 1970
- www.historylink.org/file/3086 – Seattle Times column of 3 August 1964, about 300 letters, regular tours from May 1965, Doc Maynard's as the starting point, Sunny Speidel taking over after 1988
- michaelostrogorsky.substack.com/p/raising-pioneer-squares-stree… – Streets and sidewalks in Pioneer Square raised by ten to 35 feet against the pre-fire level, construction from 1889 to 1892
- www.historylink.org/File/20904 – Washington State went dry on 1 January 1916 under Initiative 3, passed on 3 November 1914, five years before national Prohibition
- www.historylink.org/File/8639 – Seattle health officials report a typhoid outbreak on 12 September 1909, later linked to contaminated drinking water at the Alaska-Yukon-Pacific Exposition
- seattledaypass.com/seattle-underground-tour/ – Prices at Bill Speidel's for 09/2026 of $30.00 at checkout, $27.00, $20.00 and $10.00; Underworld Tour at $42.76 with a cocktail at 8 and 9 pm; roughly twenty feet of modern city overhead; about half the time above ground; group sizes of 30 to 46 against a hard cap of 25; no Seattle attraction pass covers either tour; the 15.35% tax at Beneath the Streets
- visitseattle.org/members/underground-tour-bill-speidels/ – Address and contact details for Bill Speidel's, 75 minutes, tickets online, by phone and at the counter; source of the older Underworld listing at $25 for 7, 8 and 9 pm, 21 and over with ID, cocktail included
- en.wikipedia.org/wiki/Pioneer_Square_station_(Sound_Transit) – Station under 3rd Avenue at James Street, served by the 1 Line and 2 Line, depth of 18 to 21 m, entrances
- seeingwashington.com/seattle-light-rail-guide/ – Link light rail: distance-based fares of $2.25 to $3.50, day pass $8, about 35 minutes from Sea-Tac to downtown, frequency, ORCA card
- www.nps.gov/klse/planyourvisit/fees.htm – Free admission to the Klondike Gold Rush National Historical Park
- www.nps.gov/klse/index.htm – Klondike Gold Rush National Historical Park: address 319 Second Avenue South, two floors of exhibits, no underground areas
- pioneersquare.org/businesses/beneath-the-streets/ – Beneath the Streets: 60 minutes, three sections of historic passages, address and phone number, from the neighbourhood association
- www.travelingtessie.com/allposts/underground-tour-pioneer-squar… – Source for the claims that Beneath the Streets tickets are $26 per person and that Bill Speidel's tickets are $22 for adults
- www.aaa.com/tripcanvas/thing-to-do/beneath-the-streets-undergro… – Reseller listing of the Beneath the Streets tour from $32 with the note that taxes and fees will be calculated at checkout; operator wording that the route covers four blocks, about half a mile or 0.8 km, in one hour
- www.thetravel.com/is-there-an-underground-city-in-seattle/ – Source for an abandoned subterranean city and tunnel system under Seattle, for admission of $22 for adults, $20 for seniors and students and $10 for youth, and for opening hours of 9 am to 7 pm from April to September
- seeingwashington.com/seattle-underground-tour-guide/ – Source for the claims that children under 7 go free at both companies, that adults pay about $26 at Bill Speidel's and about $13 for children, and that tickets run $13 to $26
- seeingwashington.com/seattle-underground-tour/ – Source for the claim that both companies require advance booking and that visitors should book a week ahead for Saturday afternoon and summer weekend tours
- secretseattle.co/seattle-underground-visit/ – Source for the description of a subterranean city hidden under Pioneer Square and for streets raised 22 feet
- nicenews.com/culture/seattle-abandoned-underground-city-tour/ – Source for the claim that the underground was condemned in 1907 amid city-wide panic over bubonic plague
- www.historyhit.com/locations/seattle-underground-streets/ – Source for the claims that the old ground floor was condemned in 1907 out of fear of bubonic plague, that around 2000 people lived underground at its peak, and that the underground contains whole streets
- www.journee-mondiale.com/en/i-explored-seattles-hidden-undergro… – Source for the claims of a hidden underground city 22 feet below the modern streets and of Prohibition-era tunnels once home to speakeasies and opium dens
- www.amli.com/blog/seattle-underground-tour – Source for the claim that the Seattle Underground includes more than 30 blocks of history to explore