We know we're not the only ones with childhood dreams of hidden passageways, slides, and ladders. Here are 15 radical indoor spaces that fulfill those dreams and help burn off excess energy.
N.B.: For children who prefer swings, visit 14 Children's Swings for Indoor Play.
Above: A wooden slide in a girls' bedroom. Photograph via Milk Magazine.
Above: A wall-mounted ladder serves as a climbing wall. Photograph via Mrs. Jones.
Above: A loft space in Los Angeles. Photograph by June and John Brown for OWI.
Above: This climbing wall in a child's room in New York also adds colorful accents. Photograph via AlignedNYC.
Above: A built-in slide in a house in Nakameguro, Japan, by Level Architects.
Above: A set of polished tree trunks installed upside down provide climbing areas in the Kita Drachenhöhle kindergarten, in Berlin. Photograph via Architizer.
Above: An indoor steel slide in Skyhouse, a Manhattan penthouse designed by David Hotson. Photograph via Dezeen.
Above: An interior climbing wall in Bergen, Norway, by Saunders Architecture via ArchDaily.
For rock climbers in the making, see even more examples in 5 Favorites: Children's Climbing Walls.
N.B.: This post is an update; the original story ran on November 27, 2009.