Hollow Earth Theory: John Cleves Symmes, Jr.

We've all heard of "Flat Earth Theory." But in the early 1800s, a man named John Cleves Symmes, Jr. spread his ideas far and wide, to anyone that would listen: That the Earth was hollow inside and habitable within. Did this theory actually get the support of U.S. President John Quincy Adams? In this episode, we'll find out and then we'll chat with podcast regular, mindreader Eric Dittelman!