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Seattle Underground
The Seattle Underground is a network of buried storefronts and sidewalks beneath Pioneer Square in Seattle, Washington, left behind when the streets were raised after the Great Seattle Fire of 1889.
Underground city
An underground city is a network of pedestrian walkways, shops, and transit connections built below street level downtown, letting people move without going outdoors; Montreal's RÉSO and Toronto's PATH are the best-known examples.
Underground City, Montreal
The Underground City of Montreal, officially known as RÉSO, is an indoor pedestrian network of about 32 km of tunnels linking shops, offices, hotels, and metro stations downtown.