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Beneath Beijing lies an extensive underground city known as the Underground Great Wall. Dug by hand in the 1970s during the fear of Soviet invasion, this intricate network features bomb shelters, schools, retail shops, and even a skating rink. Designed to house 300,000 people, it has unwittingly become a refuge for many homeless individuals over the years.
RESO, Canada
Montreal's RESO is a vast subterranean city that provides a solution to harsh winter conditions. In use since the 1960s, this extensive network spans 32 kilometers, includes over 2,000 shops, hotels, and concert venues, creating a vibrant cultural hub beneath the city.