The hollow Earth theory suggests vast subterranean worlds with their own sun, atmosphere, and possibly superhuman ...

Alleged occupants of Earth’s interior have since included mammoths, super-civilisations, and the aforementioned UFOs. Kept ...

Carole Barrowman, author of the Hollow Earth series, book reviewer, and lover of books, joins us to tell you all about the ...

The bold question-askers at What If explore what life would be like if Earth were hollow. Trump administration looking to ...