Love your cat or cats? Maybe you should consider making your home more friendly to your kitties by turning it into a cat playground! After all, your inside cats are more likely to spend more time in your house than you do, so why not give your kitties more places to roam? One California man decided to revamp his entire house so his 18 cats could enjoy their home. While this may seem extreme, there are plenty of things you can do to make your house into a fun place for your cats.