David Innes' Empire Literature has long held that the interior of the earth is inhabited, but nowhere in the dusty tomes of by-gone days was there a more realistic or vast inner world described than Edgar Rice Burroughs' Pellucidar. At The Earth's Core , first published in 1914, begins a seven novel series that spanned Ed Burroughs' writing career. The earth's core, according to Burroughs, was a mirror reverse of the outer world, beginning some 500 miles beneath the surface. Pellucidar has a miniature sun and stationary moon orbiting at the gravitational center of the earth. There is no night in the land of the noonday sun, thus time has little or no meaning to the inhabitants and the weird and wonderful beasts within.
Gigantic dinosaurs exist side by side with huge mammals long extinct in the outer world.
A riot of vegetation, including varieties which passed with the dinosaurs on the surface, chokes large sections of the land masses. The Pellucidar Series At The Earth's Core Innes and Perry use an iron mole to descend 500 miles into the earth to find a bizarre and primitive world. Pelludicar Innes returns to the Inner World, seeking his mate and friends. Tanar of Pellucidar Tanar has a variety of adventures. Tarzan At The Earth's Core On a rescue mission to save David Innes, Tarzan becomes separated from the mission and has to deal with the terrors of Pelludicar alone.