News American history resides in Hamilton: Capt. John Cleves Symmes and his ‘Hollow Earth’ theory January 15, 2023Jeff SuessComments Off on American history resides in Hamilton: Capt. John Cleves Symmes and his ‘Hollow Earth’ theory Capt. John Cleves Symmes declared back in 1818 that the Earth was hollow and inhabitable inside, inspiring expeditions and literature.