the Great Serpent Mound

The Great Serpent Mound in Ohio is about 1330 feet in length and three feet high.  Native American tribes see the snake as the fertile being, for bountiful crops.  The mound is shaped like a serpent about to eat an egg.  

Some think that the cave entrances around the mounds suggest the Adena people lived underground, which leads archeologists to believe there are artifacts waiting to be discovered.  (one theory)

People have done radiocarbon tests to date when the mounds could have been built, and there finding dates it back 900 years ago.  Back then the people from Fort Ancient would have been around the area, and they would have built the mound.  (Scientific results)

The significance of Serpent Mound and other ancient Ohio earthworks has garnered international attention. In 2008, Serpent Mound and eight other Ohio earthworks were selected by the United States Department of the Interior for inclusion on the United States’ Tentative List of sites to be submitted to United Nations Educational, Scientific, and Cultural Organization (UNESCO) to be put on the prestigious World Heritage List. If it is put on this list later at some time, the Serpent Mound will join the ranks of the Pyramids of Egypt, the Great Wall of China, Pompeii, Stonehenge, and the Taj Mahal—all of which are World Heritage sites. World Heritage status has the potential to elevate local and international awareness about the site's value, further encourage communities to protect and invest in their preservation, and increase potentially beneficial tourism to the site.

Interesting fact: the head of the serpent is in line with the setting sun during the summer solstice; and the coils may align with the sunrise of the solstices and the equinoxes.

Most of the mounds like this throughout the country have been eroded by farmers and rain, so the fact this one still stands is awesome.