DIY indoor playground

The City Museum is formed primarily from the detritus of the city of St. Louis, using salvaged tiles to cover the walls and floors in mosaics, salvaged gargoyles to spray water into the two-storey indoor fountain, and two salvaged airplanes that are part of the outdoor jungle gym created with steel springs, iron walkways, an old trolley, and a giant ball pit.

And yes, you get to climb all over it.