Category:Hollow Earth

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Symmes Concentric Spheres - 1878 - ill.png

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 — including the Concentric Spheres of Symmes, the Concave Earth of Koresh, etc. — and the authors of those theories.