Sometimes the strain of dealing with parents is too much for children to bear, so they must retreat to their sanctuary. Maybe a favorite tree or the linen closet or under the bed. But super-rich kids can always just head to their out-of-control playhouses, some of which cost more than cars. They have faux kitchens and room for a mini piano. One of them is a replica of a pirate ship. Unfortunately, few of them can accommodate someone over the height five feet.