The Domes, Casa Grande, AZ
Featured on an episode of Ghost Adventures, The Domes of Casa Grande are a series of unique, UFO-like structures that were the start of a facility intended to be used for computer manufacturing. Partway through construction, the project was abandoned and the unusual buildings were left to crumble in the desert sun. Beyond the safety hazard the structures pose, if you believe what the Ghost Adventures crew has to say, these domes are a breeding ground for evil. Even if you scoff at their claims of demonic activity, locals largely believed that the secluded location has made them an epicenter for cultist activity and witchcraft.