Serpent Mound is a National Historic Landmark built by the ancient American Indians of Ohio.

The effigy mound in the form of a snake with a curved tail has become an icon of Indigenous cultural achievements, primarily because of its enormous scale. It’s also on the UNESCO World Heritage Tentative List for consideration as an internationally recognized landmark.

Serpent Mound’s Indigenous builders likely created the mound in alignment with the sun's cycle.

To mark the Summer Solstice on June 20, the longest day of the year, we’re bringing you programming that showcases the significance of Serpent Mound as a sacred American Indian site.

Speakers are planned at 11 a.m., 2 p.m. and 5 p.m. each day, Friday, June 20 & Saturday, June 21, and a site overview of Serpent Mound are scheduled at 9:30, 12:30 p.m. and 3:30 p.m. More information on speakers coming soon.

Due to necessary repairs, the site’s restroom facilities will be closed. Portable toilets will be available for visitors near the path to the visitor center.