The Castle Dragon Theater playhouse has a theater stage, lower-level maze, clubhouse, rock-climbing wall and slides. This 790-square-foot, redwood playhouse is designed by Barbara Butler and costs $234,300
Specs: A 790-square-foot, redwood playhouse, built around a tree
Features: Hand-carved, fire-breathing dragons flank the stage area of the theater. (Sticky floors and creaky seats not included.) Also on the lower level is a maze with secret doors and passageways. The enclosed clubhouse is waterproofed and password-protected to keep intruders out. But in case of a siege, there's a secret escape door under one of the benches. And as an antidote to idleness, there is a tube slide, a swinging bridge, a rope net, crazy bars and a rock-climbing wall.