We have featured our fair share of unique places for cats to play and be generally lazy. The Over The Door Condo is less about being cool for them and more about saving tons of space for their favorite humans. The unit hangs on the top edge of any door and provides five levels of feline fun. Cats access through seven holes located on the front and two sides of the condo, while its polyester fabric is perfect for clawing at. At over 5′ long, it enables up to five cats to explore at once.