Leipzig , Germany.
Photo: Isabel.

Hammarbyhöjden, Stockholm, Sweden.

For sale at eBay!
Hägerstensåsen, Stockholm, Sweden.
Geneva, Switzerland.
Photo: JJKPhoto.
Here is a cat ladder from Melnik, the smallest town in Bulgaria. The place is really unique and easily a cat's paradise.

The cat Martin try his new ladder in Los Angeles, USA.
Photo: Mark.

Very Stylish!
Umeå, Sweden.
Photo: Nirina.
Reed the comments for building instructions.
Darmstadt, Germany.
Photo: Katasta.
Photo: Jahns Welt.