So the rumor is that the zombie apocalypse may have arrived. Sure, the Centers for Disease Control denies it, but what does the CDC know? Just to be on the safe side, Realtor.com put together a list of prime zombie-defense real estate capable of putting those with an unquenchable thirst for human flesh at a distance from you and your family. (You can see many more pictures of these strongholds and others at Realtor.com. This slideshow is adapted from Realtor.com with its permission.)