//
Photo: John J. Audubon, Public domain via Wikimedia Commons
A monument to area local John Symmes Jr. who proposed an updated Hollow Earth model in 1818. The monument features a stone carving of his model, which features large holes to the inner Earth at the poles.
Captain John Cleves Symmes Jr. was an American Army officer, trader, and lecturer. Symmes is best known for his 1818 variant of the Hollow Earth theory, which introduced the concept of openings to the inner world at the poles.
© OpenStreetMap contributors