From Towleroad:
Peter Cohen, Manuel Flores, and Hiroyuki Furumoto have built an indoor playland for their 15 rescue cats which is unlike anything you've ever seen.
CatguysThe playland consists of dozens of platforms, tunnels, nooks, spiraling ramps, and holes that look like a shark's gaping mouth on which the cats can scratch their backs. It even has closets with filtration systems and exhaust fans to hold the many litter boxes as well as constantly cleaning Roomba vacuums.
Cohen, who lives in Goleta, California (near Santa Barbara), says that he has spent as much as $50,000 on the project.