From the outside it looks like a normal house, but what this man has done is crazy!

What Greg Krueger has made over the last 15 years is incredible. A cat lover, he turned his house into a maze of secret passages and balconies with which his friends can move all over the house living in a parallel space to that of humans. According to Greg his obsession is due in part to the Asperger syndrome, a form of autism characterized precisely by the obsessive repetition of limited interests. This amazing work is also for him a way to keep him busy enjoying a healthy life with the company of his beloved friends.