Serpent Mound, Ohio: Exploring the Archaeological Enigma

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Ngày cập nhật gần nhất: 15/4/2026

Many experts attribute the creation of Serpent Mound in Adams County, Ohio, to the Fort Ancient culture approximately 900 years ago. This ancient effigy mound stretches nearly a quarter of a mile and depicts a massive serpent, potentially clutching an egg in its mouth. MPI/Getty Images

Picture yourself in ancient times, residing in what is now Ohio. One day, you and your companions decide: Let’s create a 1,376-foot-long (419-meter-long) serpent sculpture along the rim of this meteorite crater!

If only we could travel back in time to inquire about the inspiration behind such a monumental creation. Fortunately, archaeologists are here to help us uncover the mysteries.

Serpent Mound, Ohio, situated in the southwestern part of Ohio, is a massive earthen structure — the biggest serpent-shaped effigy globally. Discover more about this intriguing archaeological wonder.

Was Ohio's Serpent Mound Constructed by the Fort Ancient Culture?

Serpent Mound winds its way along a plateau overlooking the Serpent Mound crater, an ancient meteorite impact site. Wikimedia Commons (CC BY-SA 4.0)

Some experts attribute the construction of Serpent Mound to the Fort Ancient peoples around 900 years ago, while others contend that the site predates this period and that the Fort Ancients merely restored it.

Despite the absence of human remains or artifacts within the winding, grassy mound known as Serpent Mound, nearby graves and burial mounds, likely constructed by the Adena culture — the predecessors of the Fort Ancient people in the region — around 500 C.E., suggest a connection to ancient rituals.

Nevertheless, Serpent Mound falls into the category of effigy mounds, which are earthworks shaped like animals such as bears, lynxes, bison, or birds, often serving as burial grounds for ancient civilizations.

Serpent Mound as an Ancient Calendar

Serpent Mound is positioned on the rim of a meteorite crater, with the serpent effigy measuring between 19 and 25 feet (6 and 7.5 meters) in width and standing approximately 3 feet (1 meter) above the surrounding terrain. Its head is formed by a rocky cliff overlooking a nearby creek.

While its exact purpose remains unclear due to the lack of burials, Serpent Mound functions as a calendar — the summer solstice sunset aligns perfectly with the serpent's head.

The three curves on the eastern side of the serpent's body align precisely with the sunrise during the equinoxes, while the coils of its tail correspond with the winter solstice.

Is Serpent Mound Included in the World Heritage List?

As reported by Ohio History Connection, in 2008, the U.S. Department of the Interior selected Serpent Mound along with eight other Native American earthworks in Ohio for the United States' provisional list of sites to propose to UNESCO (the United Nations Educational, Scientific, and Cultural Organization) for recognition as World Heritage Sites.

Other notable sites on this list include the pyramids of Egypt, the Great Wall of China, Pompeii, Stonehenge, and the Taj Mahal.

Although still on UNESCO's tentative list, the organization acknowledges its exceptional universal significance:

"[The] monumental geoglyph encapsulates core cosmological principles of an ancient Indigenous American Indian culture. Serpent Mound stands as the pinnacle of prehistoric effigy mound construction globally and is part of a broader tradition of effigy mound building among Native American cultures in the Eastern United States. Its strikingly lifelike depiction makes it instantly identifiable as a serpent, while its form also aligns with astronomical events to signify seasonal changes. The Great Serpent was believed to hold immense spiritual power, which a widespread pre-Columbian culture could call upon for assistance in hunting and healing."

Planning Your Visit to Serpent Mound State Memorial

Serpent Mound is situated along Brush Creek in Adams County, Ohio. This map was featured in "Ancient Monuments of the Mississippi Valley" by E. G. Squier in 1848. NNehring/Getty Images

Serpent Mound, part of the Serpent Mound State Memorial, is recognized as a National Historic Landmark in Peebles, Ohio. The site includes a museum with exhibits exploring the region's geological history.

The site remains closed on Mondays and select holidays but is open to visitors throughout the rest of the week.

Now That's Fascinating

In 1847, surveyors Ephraim Squier and Edwin Davis conducted the initial mapping and documentation of "The Great Serpent Mound."

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