Ohio’s Landmark: The Great Serpent Mound
The early North American “Mound Builders” resided predominantly in the current Ohio Valley and Mississippi regions. The Adena people, the most ancient among them, thrived from 1000 BCE to 200 BCE, leaving behind numerous mounds stretching across North America, from Wisconsin to Mississippi.
One of the rare surviving relics from these mound builders is the Great Serpent Mound – a prehistoric effigy mound in southern Ohio, extending 1,330 feet long and rising three feet high. The earliest interpretations suggest that it portrays a serpent devouring an egg, though an intriguing alternative theory proposes the serpent is swallowing the moon.
Photo by depositphotos.com
The colossal geoglyph encapsulates the fundamental cosmological concepts of an indigenous ancient American Indian culture. The Serpent Mound is an epitome of prehistoric effigy mound-building globally and stands as a tradition among some current American Indian cultures in the Eastern United States. The exceptionally realistic quality makes it immediately identifiable as a serpent, and its shape also astronomically indicates the change of seasons. Elements of the serpent mound and its positioning imply potential connections with astronomy. The head of the serpent aligns with the sunset on the summer solstice, while its tail aligns with the sunrise during the winter solstice. It’s plausible that the mound functioned as a form of calendar, signaling appropriate times for planting or harvesting. Maybe, the Great Serpent held immense spiritual power, enabling the widespread pre-Columbian culture to draw upon it for hunting assistance and illness remedies.
The builders of the Great Serpent Mound remain uncertain. While similar structures and nearby burial grounds were constructed by the Adena people, charcoal sourced from the mound is dated later in history, around 1000 CE, implying that the Fort Ancient peoples might have constructed the mound. They inhabited the Ohio Valley from 1000 CE to 1550 CE.
Located within the Serpent Mound State Memorial, this effigy has achieved National Historic Landmark status. A nonprofit organization, Arc of Appalachia, operates a museum in the mound’s vicinity.
Photo by depositphotos.com
Animal or human-shaped geoglyphs, known as effigy mounds or intaglios, are found globally. The only such site currently listed on the World Heritage List is the Lines and Geoglyphs of Nasca and Pampas de Jumana in Peru. Additional examples include the Uffington Horse, the Cerne Abbas Giant, the Serpent Mound at Loch Nell in the UK, the Serpent Mound at Rice Lake, Effigy Mounds National Monument in Iowa, and the Blythe Intaglios in California. The size of the Serpent Mound surpasses all other securely documented effigy mounds and is larger than most geoglyphs worldwide.
Address:
3850 OH-73
Peebles, Ohio, 45660
United States
UnusualPlaces Field Notes
- Location
- Serpent Mound, Peebles, Adams County, Ohio, USA
- Coordinates
- 39.0258204, -83.4301203
- Access
- Serpent Mound is managed by the Ohio History Connection; enter only during posted gate hours, with no after-hours entry. During tower construction, most of the site remains open by the western leg of the loop, but visitors must approach and return on that path; fencing blocks the path beside the tower. Expect construction activity. The operator's tower page still says the tower is closed pending a reopening announcement; its September 10, 2026 special-event page invited guests to climb it, so do not assume routine tower access. Leashed pets are allowed. Check the operator's page for closures before setting out.
- Admission
- The Ohio History Connection lists $8 per vehicle; members enter free, and motorcycles and military visitors are listed at $4. Special programs can have separate terms; the September 10, 2026 evening event was free. Confirm current fees with the operator.
- Time needed
- The operator's archaeology tour lasts about 1.5 hours. It does not publish a recommended duration for independent visits; construction currently requires approaching and returning along the western loop leg.
- Best season
- No preferred visiting season is published. The site may close during inclement weather and hours change in winter. Check the current operating notice before travel.
- Opening hours
- Current operator schedule: Tuesday–Saturday 10 a.m.–5 p.m.; Sunday noon–5 p.m.; closed Monday. Final entry is 4 p.m.; all visitors must leave by 5 p.m. Listed holiday and weather closures apply, and access outside open hours is prohibited. The tower remains under construction and closed pending a separate reopening notice. Later in the calendar year the site says its winter schedule will also close Tuesdays; check the operator's page for when that change takes effect.
- Location checked
- 2026-10-08
- Facts checked
- 2026-10-16
Location
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