This book is about legends of the Hollow Earth and other underground cities and civilizations which might all be related. The concept of there being a hollow Ea

A two-volume steampunk extravaganza. Accompanied by Edgar Allan Poe, a nineteeth-century farm boy travels through the vast interior of the Hollow Earth to prese

Sandifer has been studying Euler for decades and is one of the world’s leading experts on his work. This volume is the second collection of Sandifer’s “Ho

A gripping history of the polar continent, from the great discoveries of the nineteenth century to modern scientific breakthroughs Antarctica, the ice kingdom h

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