At the Earth’s Core

At the Earth's Core (1914) by Edgar Rice Burroughs is the first novel in the Pellucidar series, a groundbreaking work of science fiction and adventure that blends fantasy with exploration. This novel marks the beginning of Burroughs' imaginative journey to the center of the Earth, where an entire hidden world, called Pellucidar, exists beneath the Earth's surface.

The book is known for its pulp adventure and romantic escapades, combined with Burroughs' signature world-building and thrilling action sequences. It stands as an early example of the hollow Earth subgenre, a concept that suggests the interior of the Earth is a vast, unexplored land, often inhabited by prehistoric creatures, ancient civilizations, and mysterious forces.