09/12/2026
📌 Serpent Mound — Adams County, Ohio
📍 39°01'34.41"N 83°25'42.52"W
An updated scan reveals Serpent Mound in even greater detail, and even from directly above, it's still hard to take in all at once.
One of the most iconic prehistoric earthworks in North America, Serpent Mound stretches approximately 1,348 feet along a narrow ridge overlooking Ohio Brush Creek. The effigy depicts a serpent with a tightly coiled tail and a sinuous body winding through a series of graceful curves before ending in a striking oval feature, often interpreted as an egg, the sun, or something being consumed by the serpent. The earthwork averages about 3 feet high and ranges from 20 to 25 feet wide, dimensions that make its full form nearly impossible to appreciate from the ground.
Radiocarbon dating suggests the visible serpent was built around AD 1070 by the Fort Ancient culture, though excavations have also documented much earlier Adena activity at the site, including nearby burial mounds more than a thousand years older. That's fueled ongoing debate over whether the Fort Ancient people built the serpent entirely from scratch, or deliberately built on top of a landscape that was already considered sacred.
The mound's placement appears deliberate in another way too. It sits on the rim of the ancient Serpent Mound cryptoexplosion structure, a deeply eroded meteor impact feature estimated to be more than 250 million years old. Researchers have also proposed astronomical alignments involving the summer solstice sunset, winter solstice sunrise, and major lunar standstill events, though exactly what those alignments meant to the builders remains the subject of ongoing study.
Visitors can see portions of the monument from ground-level observation platforms, but LiDAR reveals what the ground simply can't, the full elegance and precision of the design as one continuous whole. More than nine centuries after its construction, Serpent Mound remains one of the world's greatest surviving effigy mounds, still raising questions about the engineering, cosmology, and ceremonial traditions of the people who shaped this remarkable monument into the Ohio landscape.
