While Ohio is full of multiple mounds and earthworks from various cultures, there’s no earthwork in the world that compares to the Great Serpent Mound in Peebles—but what’s even more intriguing about the mound is its indefinite purpose, which continues to baffle archaeologists and anthropologists alike. If you’ve yet to see this marvel for yourself, you need to check it out. Serpent Mound in Ohio is truly unlike anything else you’ve ever seen in the world.

The largest (and most strangely shaped) effigy mound in both North America and the world can be found right here in Ohio in Adams County.

Corey B. Stevens/iStock / Getty Images Plus via Getty Images

The 1,348 ft. long uniquely shaped mound depicts a snake, with an oval shape at its head.

Justin Masterson/Flickr

The original purpose of Serpent Mound remains a mystery, but there is some evidence for astronomical correlations, according to arcofappalachia.org.

Krista Backs/Flickr

Although no artifacts or written records were found near the mound to determine who built it, a nearby village site shows evidence of occupation by both the Adena and the later Fort Ancient Cultures.

Jimmy Emerson, DVM/Flickr

It was built around 1000 A.D., most likely by the Fort Ancient culture and was likely used as a place of ceremony.

The Last Cookie/Flickr

Markers at the sight point toward the summer solstice sunset, as the oval two-head area is aligned with the summer solstice sunset.

peggydavis66/Flickr

Capturing the whole thing in a photo is difficult, but absolutely amazing when possible—and you can always climb the observation tower for a better view.

Katherine Bowman/Flickr

Have you ever explored Serpent Mound in Ohio? If so, we want to know what your experience was like. Share your thoughts and photos with us!

Corey B. Stevens/iStock / Getty Images Plus via Getty Images

Justin Masterson/Flickr

Krista Backs/Flickr

Jimmy Emerson, DVM/Flickr

The Last Cookie/Flickr

peggydavis66/Flickr

Katherine Bowman/Flickr

For more interesting mounds and earthworks in Ohio, check out our previous article: 9 Ancient Earthworks In Ohio You Won’t Find Anywhere Else In The World.

OnlyInYourState may earn compensation through affiliate links in this article.

Address: Serpent Mound State Memorial, 3850 OH-73, Peebles, OH 45660, USA