Check out the rainbow nest dome at the Takino Hillside Park in Sapporo-shi, Japan. How cool would it be to climb through that?

The Seattle Center’s Fun Forest was a virtually unique family amenity: an outdoor amusement park near the center of a modern American city. And our children deserve to have it replaced with something just as unique, and just as entertaining, instead of yet another pay-for-view museum.

So if you were designing a really kick-ass playground, what might it look like?