Pellucidar

A Journey to the Interior of the Earth

Symmes's Theory of Concentric Spheres

Demonstrating that the Earth is hollow, habitable within, and widely open about the poles

The Holy Earth

Plato's Doctrine Respecting the Rotation of the Earth and Aristotle's Comment Upon That Doctrine

At the Earth's Core

At the Earth's Core

A Journey to the Center of the Earth

Pellucidar

A Journey into the Interior of the Earth

At the Earth's Core

One Hundred Proofs That the Earth Is Not a Globe

Etidorhpa; or, The End of Earth.

The Strange History of a Mysterious Being and the Account of a Remarkable Journey

A Journey to the Centre of the Earth