Serpent Mound near Chillicothe, Ohio, 1982. This is the largest effigy mound in the world, an embankment of rock and earth over 1300 feet in length, 20 feet wide, and 4 feet high. The serpent’s jaws are open, about to seize an oval object (a slightly elevated earth mound some 158 feet long and 79 feet across, and said to symbolize an egg). Its tail is in a triple coil. The Adena people built the Serpent Mound for ceremonial purposes between about 1000 and 300 BC.
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