Casa Grande, Arizona: Mysterious Domes

The Domes were built to facilitate the manufacturing of computers back in the late 1970s and early 1980s, but they were never completed -- evident from a couple of foundations that were started and left unfinished. One of the buildings is shaped like a flying saucer and the other three are as if spheres were joined together, looking like huge concrete caterpillars.

Talk from the locals about the Domes concerns ritualistic witchcraft and satanic worship. "Stay out of there and don't go into the tunnels," is the refrain, and indeed there are tunnels under the east end of this facility. But despite all the stories, it's unclear if anything more sinister has happened there than underage beer drinking and an occasional squatter spending the night. Nonetheless, staying out of the tunnels is probably advice wisely heeded.