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

With their snowcapped peaks and glacial valleys, the Austrian Alps should be adventure enough. But no: hidden between mountain ranges, the Area 47 adventure park features, among countless other diversions, a high ropes course strung 88 feet over the rushing whitewater of the Otztal River, a brand new hydrospeed slide so fast (27 miles an hour!) that you're required to wear a helmet, and a guided spelunking adventure 1,500 feet deep in Amberg Mountain.