Housed in the former home of the 10-story International Shoe Company, the sprawling 600,000 square-foot City Museum in St. Louis is quite possibly the ultimate urban playground ever constructed. The museum is the brainchild of artist and sculptor Bob Cassilly who opened the space in 1997 after yeaSource: City Museum: A 10-Story Former Shoe Factory Transformed into the Ultimate Urban Playground | Colossal
