Greg Krueger has spent 15 years turning his home into a wonderland for his cats. The playground includes over 100 yards of catwalks, a choice of hideouts, and whimsical tunnels and stairs. Krueger describes it as a puzzle he never quite finishes, and he loves to work on it for his family — his furry, four-legged family, of course. Purrfect!

Be sure to check out the cat house built by Peter Cohen as well!