Savage Pellucidar
by Edgar Rice Burroughs
When David Innes and Abner Perry went to search the mineral deposits on the recently invented Perry Mechanical Street, they never imagined exploring the beautiful, terrifying world of Pelucidar five hundred miles below their feet. Thrown into the land of men, beautiful women and fierce warriors of evil monsters, David and Abner go sharply across. David and his companion Diana the Beautiful set out to teach Pellucidar the ways of civilization and manage to collect a series of primitive kingdoms in the Pellucidar Empire. Meanwhile, Abner turns his creative genius to the science of aviation, with dire consequences for both David and Diane.