Symmes Monument

Historical marker location:

436 S 3rd S, Hamilton, Ohio

( Marker is on South Third Street near Charles Str, on the left when traveling south.)

Marker installed: 1991

Hollow Earth Theory.

Ohio has a rich tradition of aviation history, with several famous aviators hailing from the state. In addition to the Wright brothers, who invented the airplane, other notable Ohio aviators include Neil Armstrong, the first person to walk on the moon, and Jerrie Mock, the first woman to fly solo around the world.