Uploaded April 2016 | Updated September 2026, 1 hour ago
Did you know that Cincinnati is famous for our landslides? Did you know we were once the home of a warm shallow sea? Did you know that most of Ohio was once covered by a great wall of ice? Learn many fascinating facts from professional geologists as we visit many of Ohio's scenic natural wonders.
Did you know that Cincinnati is famous for our landslides? Did you know we were once the home of a warm shallow sea? Did you know that most of Ohio was once covered by a great wall of ice? Learn many fascinating facts from professional geologists as we visit many of Ohio's scenic natural wonders.


![Great Wonder of the Ancient World - The Great Serpent Mound
The Great Serpent Mound is a 1,348-foot (411 m)-long,[2] three-foot-high prehistoric effigy mound on a plateau of the Serpent Mound crater along Ohio Brush Creek in Adams County, Ohio. Maintained within a park by the Ohio History Connection, it has been designated a National Historic Landmark by the United States Department of Interior. The Serpent Mound of Ohio was first reported from surveys by Ephraim Squire and Edwin Davis in their historic volume Ancient Monuments of the Mississippi Valley, published in 1848 by the newly founded Smithsonian Museum. Great Wonder of the Ancient World - The Great Serpent Mound](https://i.ytimg.com/vi/GH3l6RpAfFE/mqdefault.jpg)







