Subterranean Realms is a unique book that surveys underground and rock cut structures created in the past. It is the third book in Mutton’s trilogy on mysteri

Subterranean Realms is a unique book that surveys underground and rock cut structures created in the past. It is the third book in Mutton's trilogy on mysteriou

The idea that the Earth is hollow has inspired both the world of science and the world of fiction. As a scientific concept, this notion has informed the works o