Field file 01 · Underground · Washington
Seattle Underground
Seattle, Washington · Puget Sound · Buried streets
Record
Why it matters
Buried storefronts and sidewalks left below Pioneer Square after Seattle rebuilt above its old street level following the Great Fire of 1889.
Field note
This is not an open tunnel system. Public access is through authorized guided tours that enter specific sections beneath Pioneer Square.
Evidence line
This file is marked Documented because the place and its history are supported by the linked authoritative source. Practical details were last checked in July 2026. Conditions change. Check the primary source before leaving home.
Access
How to approach it lawfully
Uneven surfaces and stairs. Book with an authorized operator.
- Access status
- Guided only. Entry is only through an authorized guided tour. Recorded as: Guided tour only.
- Reservation
- No reservation requirement recorded. Confirm with the official source.
- Seasonality
- No seasonal limit recorded. Hours still change; check before traveling.
Practical details last checked July 2026. Conditions change. Check the primary source before leaving home.
Plan the stop
What to plan for
- Time
- 75 minutes
- Cost
- Ticketed (Ticketed)
- Terrain
- Not recorded in this file. Check the official source.
- Mobility
- Uneven surfaces and stairs.
- Parking
- Not recorded in this file. Check the official source.
- Weather
- Not recorded in this file. Check the official source.
Directions to the public entrance Opens Google Maps with these coordinates. The provider sees them under its own privacy policy. Confirm the entrance against the official source first.
Record
Sources
- Primary sourceBill Speidel's Underground Tour , opens in a new tab
Sources are summarized in the Atlas's own words and checked on the dates shown. See the methodology, or send a correction.
Road file
Carry it forward
Saved stops stay in this browser. No account. Export from the road file page when you want a copy.
On the curated route Cascade Signal.
Book the tour, not the trouble.
No partner link on this file. Use the official source for tickets and tours. How partner links work.