"Located in a former shoe factory, City Museum devotes 600,000 square feet and four levels to play for all ages. The museum was the brainchild of artist and entrepreneur Bob Cassilly—along with a crew of 20 artisans known as the Cassilly Crew—who constructed the space from objects found around the city, from construction cranes and fire trucks to church pipe organs, old airplanes, and plenty of reclaimed building materials. The result is a wonderfully weird and wacky museum that’s constantly evolving, depending on what’s been donated and collected recently. There’s a sky-high jungle gym, a rooftop Ferris wheel, an aquarium, and multi-story slides that once served as chutes for shoes. The museum has a “no map” policy to encourage exploration, but does advise visitors to bring their own flashlight—you never know what you’ll find in those dark caves."