7 of the World's Most Epic Adult Playgrounds, Because Adults Like to Have Fun Too

At St. Louis, Missouri's City Museum you'll find 600,000 square feet of salvaged materials, including two abandoned planes, that have been turned into a playground for adults. Take a ride down a 10-story slide, catch a pop-up circus, go for a spin on a Ferris wheel (on the roof!), wander through man-made caves and order bespoke shoelaces made on a sewing machine that dates back to the 1800s. Insider tip: the best time to visit is Friday or Saturday night, when the place is open only to adults.