First English translation of the book that introduced the realm of Hollow Earth. Explores the underground world of Agarttha, sometimes known as Shambhala, a rea

First English translation of the book that introduced the realm of Hollow Earth • Explores the underground world of Agarttha, sometimes known as Shambhala, a

Beliefs in mysterious underworlds are as old as humanity. But the idea that the earth has a hollow interior was first proposed as a scientific theory in 1691 by