Bill Speidel's Underground Tour (Pioneer Square)

Bill Speidel's Underground Tour, founded on research by local historian Bill Speidel, departs from a storefront in Pioneer Square and offers guided walking tours of Seattle's subterranean 'underground' spaces. The tour interprets how original ground-level storefronts and sidewalks were buried when streets were raised after the Great Seattle Fire of 1889 and includes preserved underground passageways and basements. It has operated as a long-running historic-tour attraction that helped spark preservation interest in Pioneer Square.