Southern Ohio is hiding the world’s largest sacred snake, and it’s made of ancient earth

It’s the world’s largest serpent effigy

You drive through southern Ohio farmland for miles, past small towns and rolling hills, and then you reach a plateau above Ohio Brush Creek near Peebles in Adams County.

Stretched across that plateau is a winding snake made of earth, 1,348 feet long and rising only a few feet off the ground. Ancient hands shaped it from layers of clay, ash and stone without a single metal tool.

No other serpent effigy mound on Earth comes close to its size, and the questions about who built it and why are still wide open.

Two cultures, one mound and zero answers inside it

Archaeologists have gone back and forth on this one for more than a hundred years.

A 1991 radiocarbon study pointed to the Fort Ancient culture, dating the mound to about 900 years ago. Then a 2014 study using new core samples pushed that date back to around 300 B.C., which puts it in the hands of the Adena culture.

Most researchers now think the Adena built it and the Fort Ancient people kept it up later. Nobody has found a single artifact inside the serpent itself, and it is not a burial mound, though three burial mounds sit close by.

A quarter-mile snake on a 250-million-year-old crater

Right beneath your feet, the ground holds a secret older than the mound by millions of years.

The serpent sits on the rim of an ancient meteorite impact crater, roughly five to 8.7 miles across and formed more than 250 million years ago.

It is the only confirmed meteorite crater in Ohio.

Erosion has worn away most visible traces, so you will not spot it from the ground. But the unusual terrain here may explain why the ancient builders chose this exact spot.

The serpent’s head faces the summer solstice sunset

The snake’s head points toward the general direction of the summer solstice sunset.

Some researchers think the curves of the body line up with solstice and equinox sunrise points too, but the sight lines are short and the curves are broad, so confirming exact alignments is tough.

Whether the builders planned it that way or the terrain guided the shape is still an open question. Those possible connections to the sky have drawn comparisons to Stonehenge and other ancient sites around the world.

Walk the full length without stepping on it

A paved path runs the entire 1,348-foot stretch of the mound, and you can follow every curve and coil up close.

You cannot walk on the mound itself, because the site is preserved and protected, but the path puts you right beside it. Informational signs along the way explain the history and construction.

An observation tower built in 1908 gives you an overhead look at the full serpent shape when it is open.

The path is easy and works for most ages and abilities.

A small museum with a big story to tell

Near the parking lot, a small museum walks you through the mound’s shape, how it was built and the geology underneath it.

Displays cover both the Adena and Fort Ancient cultures and their ties to this land. A short video lays out the mound’s history and why it matters.

Before you leave, the gift shop sells authentic Native American-made items, local artwork and books on archaeology. You can spend 30 minutes in there and come out knowing a lot more than when you walked in.

Hike down to Ohio Brush Creek and back

If you want to stretch your legs beyond the paved path, the Ohio Brush Creek Hiking Trail drops into the valley below the mound.

It runs about half a mile through rock outcroppings, wooded areas and views of the creek before looping back up near the serpent.

A separate outer loop trail adds more elevation and wider views of the landscape. The forested hillsides light up with wildflowers in spring, so timing your visit right pays off.

Three burial mounds guard the serpent’s flanks

Three ancient burial mounds sit near the serpent, two built by the Adena culture and one by the Fort Ancient people.

The larger Adena mound started with the burial of a significant individual more than 2,000 years ago.

Harvard archaeologist Frederic Ward Putnam excavated them in the late 1880s and pulled burial artifacts from the earth.

One mound stands near the east end of the parking lot, the other near the west end. These are sacred sites, so treat them with respect when you visit.

Celebrate the solstice at a free festival

Every summer, the Friends of Serpent Mound put on a free Summer Solstice Celebration Festival near the site. You will hear from historians, Indigenous speakers, scientists and musicians throughout the day.

Presentations cover the mound’s history, local ecology and Appalachian heritage. The festival wraps up with a caravan out to a nearby viewpoint on the crater rim.

It is family-friendly and one of the best ways to experience the site near its most famous alignment with the setting sun.

Tag along with archaeologist Bill Kennedy

The Ohio History Connection runs guided archaeology tours every second and fourth Friday of the month during the season.

Archaeologist Bill Kennedy leads each one, starting at the museum visitor center at 1:30 p.m. and running about an hour and a half. You do not need a reservation, but make sure you arrive before the 4 p.m. gate closure.

The tours cover the broader story of pre-contact Native Americans in Ohio and dig into the details of Serpent Mound itself.

A Harvard professor bought 60 acres to save it

By the 1880s, farming and development were tearing through ancient mounds across Ohio.

Frederic Ward Putnam, a Harvard archaeologist, raised enough money to buy 60 acres around the serpent and keep it intact.

Harvard handed ownership to the state of Ohio in 1900, and the site became one of the first archaeological preserves turned into a state park in 1919.

In 1964, it earned National Historic Landmark status. Today it sits on the UNESCO World Heritage tentative list.

A rural plateau with few distractions and deep roots

People come from around the world to stand beside something built thousands of years ago in rural southern Ohio.

The Ohio History Connection manages the site with support from community groups like the Friends of Serpent Mound.

Parking runs $8 per vehicle, and the grounds are open Wednesday through Sunday. You can bring your dog on a leash.

There is not much commercial clutter nearby, just open country and a mound that has held its shape for centuries.

Visit Serpent Mound in Peebles, Ohio

You can find Serpent Mound at 3850 State Route 73 in Peebles, Ohio.

The site is open Wednesday through Saturday from 10 a.m. to 5 p.m. and Sunday from noon to 5 p.m., closed Mondays and Tuesdays.

Last entry is at 4 p.m., the gift shop closes at 4:30 p.m. and everyone heads out by 5 p.m. Parking costs $8 per vehicle, with a military discount available.

Check the official website and social media before you go for any weather or maintenance closures.

This article was created with AI assistance and human editing.

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