In 1818, John Symmes published a theory that “the earth is hollow, and habitable within,” with openings at the North and South Poles. Inside was a “warm and rich land, stocked with thrifty vegetables and animals, if not men.” They became known as "Symmes Holes", or after 1861 as "Holmes’ Hole".
In 1818, John Symmes published a theory that “the earth is hollow, and habitable within,” with openings at the North and South Poles. Inside was a “warm and rich land, stocked with thrifty vegetables and animals, if not men.” They became known as "Symmes Holes", or after 1861 as "Holmes’ Hole".