Hollow Earth
The Hollow Earth is a concept proposing that the planet earth is entirely hollow or contains a substantial interior space. Notably suggested by Edmond Halley in the late 17th century.
In ancient times, the concept of a subterranean land inside the Earth appeared in Mythology, folklore and legends. . The idea of subterranean realms seemed arguable, and became intertwined with the concept of "places" of origin or afterlife.
