The Earthworks were built between 1,600 and 2,000 years ago by the Hopewell Culture and served as sacred ceremonial sites.
The National Park Service and Ohio History Connection now maintain them.
Driving the news: In honor of World Heritage Week, the Earthworks are hosting tours and events all week.
Stop by: If you're up for a day trip this weekend, Fort Ancient Earthworks and Nature Preserve is open for hikes, archaeological tours, and cooking and gardening demonstrations.
Yes, but: It's in Oregonia, about a three-hour drive from Cleveland.