Ever since I first found your wonderful blog I've been looking for this picture. It's a photocopy of a picture in an article in a German magazine, probably Stern, probably twenty years ago. It shows the Aichach prison with catladders. There was also a picture of men prisoners feeding the cats, but I haven't got that any longer. The text underneath says Facade of Aichach prison (JVA = Justizvollzugsanstalt) with cat ladder.
Regards, Margaret M