39° 1'33.00"N 83°25'46.66"W
The Serpent Mound is 1,370 feet long. The most likely builders are the Adena Culture (800 BCE - 100 CE), the Hopewell culture (200 BCE - 500 CE), and the Fort Ancient Culture (1000 CE -1650 CE). Radio carbon dating of materials discovered in 1996 (see below) has indicated that the mound was built circa 1050 CE. This suggests that it was built by the Fort Ancient culture. The mound was built close in time to the appearance in the sky of a supernova which left behind the Crab Nebula (1054 CE), and may have been built in recognition of the strange light in the sky. More on Serpent Mound.
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