Cost: Unknown

Customizing a house, like modifying a car, is one of the worst investments you can make. And when you build a subterranean bat cave in your Albuquerque home, you'll be lucky to get a penny back on the dollar in this real estate market. According to Granger, "It will have a few aspects from the Christian Bale movies, like a drive-in pathway or tunnel that lights up as you drive through...You park your car on this big circle, and the circle spins, so that you never have to back the car out." Wait, nevermind. This sounds awesome, actually.