I am not a cat person, but I found this blog that collects images of cat ladders fascinating. Simply and accurately described as "A picture gallery and a tribute to all the fantastic cat-ladders of the world.", the blog is a great source of inspiration and cat-friendly engineering — let's just hope that only welcomed critters use these elaborate stairways!
For urban, indoor cats, be certain not to miss House Tour: Bill and Maria's Cat Playground.
Check out over 600 images of Cat Ladders from around the world: Cat Ladders.
(Images: Cat Ladders)