haven't seen a thread on this: Ancient astronomical observatory unearthed in Georgia was doomsday clock? - Savannah Day Trips | Examiner.com
About three hours west of Savannah, archaeologists unearthed an ancient Indian mound which had a secret hidden chamber inside. Inside this secret chamber was a circle of fifty seats and an altar in the shape of a hawk or eagle. Known as the Ocmulgee Earthlodge, new evidence proves this earth-covered building was a sophisticated piece of engineering with precise astronomical alignments that likely served as an astronomical observatory. It also appears to have served as a type of doomsday clock forewarning its designers as to the next severe meteor storm.