Kipa is an indoor playground in Calw, Germany. It is run by some wonderful folks who always made us feel right at home.
This facility used to be an indoor tennis court, probably built when Boris Becker was all the rage. I miss being able to go to these places--they are perfect when the weather is bad.
You can still see tennis balls embedded in the girders in the roof, although this picture would beg to differ on that fact.