author
John Cleves Symmes
1780–1829
Best known for championing the Hollow Earth theory, this former Army officer turned one of early America’s most memorable scientific outsiders. His lectures, pamphlets, and bold claims about openings at the poles helped turn a fringe idea into a lasting piece of literary and scientific folklore.
1 Audiobook
Symmes's Theory of Concentric Spheres Demonstrating that the Earth is hollow, habitable within, and widely open about the poles
by James McBride, John Cleves Symmes
About the author
Born on November 5, 1780, John Cleves Symmes Jr. was an American Army officer, trader, and lecturer who later became famous for promoting his own version of the Hollow Earth theory. After military service, including service during the War of 1812, he shifted his energy toward public lectures and printed arguments about the structure of the planet.
In 1818, he began circulating his ideas in a now-famous circular that argued the Earth was hollow and open at the poles. He spent the rest of his life trying to persuade audiences, politicians, and explorers to take the theory seriously, turning himself into a curious mix of soldier, showman, and self-styled scientific thinker.
Though his theory was rejected by mainstream science, Symmes left a real cultural mark. His ideas fed popular fascination with polar mysteries and imaginary worlds, and they became part of the wider history of speculative writing and pseudoscience in the United States. He died on May 28, 1829, in Hamilton, Ohio.