Prague, Czech Republic.

Photo: Jacques


Germany.
Photo: Patchouli

Germany.
Photo: Leni05
Somewhere in Switzerland.

Photo: DanFranPics
NEW LINK ADDED!
Wallcats. Check it out!
Mexico.
Photo: El Becerrito Capulín.


Redondo Beach (very close to Los Angeles), California, United States.
Photo: The Torr Guide
Hjorthagen, Stockholm, Sweden.

Somewhere in Switzerland.
Reed (in German) a detailed construction blueprint here.


Some great indoor ladder at The Pulaski County Humane Society
Dublin, Virginia, USA.
Årsta, Stockholm, Sweden.
And here is the proud owner!