CASA GRANDE &mdash; Oddity seekers will find a bonanza&nbsp; when they come across a set of round relics squatting in the desert south of Casa Grande. At first glance, they look like abandoned UFOs. Closer inspection reveals they&rsquo;re manmade, and they&rsquo;re sort of spooky. They&rsquo;re a series of domes. Some stand (or squat) alone; others are connected so they resemble a giant caterpillar. All are abandoned and have been sev