Category:Hollow Earth



Our collection on the speculations about the nature and inhabitants of our Hollow Earth (or, if you prefer, Cavern World), the many theories as to the form and nature of that hollowness &mdash; including the Concentric Spheres of Symmes, the Concave Earth of Koresh, etc. &mdash; and the authors of those theories.

Reading

 * &mdash; [revised edition, nearly 400 pages added]
 * &mdash; [revised edition, nearly 400 pages added]
 * &mdash; [revised edition, nearly 400 pages added]