Growing up in Ohio, I learned state history in elementary school. I remember clearly learning about the Native American Moundbuilders, who created mysterious mounds ranging from a single mound to complex formations.
One of the most mysterious is the Serpent Mound, the largest mound in North America and the largest snake geoglyph in the world, stretching 1,348 feet long and about 20 feet wide.
Located near Peebles, in southern Ohio, it is in a rural area, surrounded by massive trees.
I visited again recently when I introduced two friends to the mound. I had taken my children to the mysterious mound decades ago.
We started our visit at the museum where the mysteries unfold, and research is discussed. We then walked the short distance to the mound, reading placards along the way.
It is not a burial mound but a huge earthwork in the shape of a snake.
The most common theory of the Serpent Mound’s origin holds that it was built by the Adena culture or its Hopewell descendants, from whom the Mississippian culture originated. Among the thousands of mounds scattered in the valleys of the Mississippi and Ohio rivers, the serpent mound is the most impressive.
More recent research suggests it was built by the Fort Ancient culture and is about 900 years old. Other scholars’ theories fluctuate from 1000 BC. to 1000 AD. Its unique structure, along with the absence of human remains in the area, creates a deeper mystery. Whoever did this feat harnessed the whole community, and obviously for an important purpose.
Whatever the theory, it remains a mystery why it was built in the first place.
At the center of the serpent is a tower where visitors can climb for a better view. The serpent has an open mouth, presumably eating an egg. The body of the snake makes several turns and curves. The mouth of the serpent faces the exact direction of the summer solstice sunset, and the tail of the serpent faces the exact direction of the winter solstice sunrise. Scientists believe that the Serpent Mound was used as a tool to determine seasonal changes and certain dates throughout the year.
After going up in the tower, we walked to the end of the tail, then walked to the mouth.
We took our time strolling along the mysterious geoglyph. There were a few other people at the site, but everyone spoke softly, making the mysterious location seem reverent.
It was a wonderful experience introducing my friends to this mystery. It is well worth the drive to the mound in rural Adams County.
For more information on visiting this National Historic Landmark and special events, including the summer solstice (June 20, 2026), click here.
