At the Earth's Core

At the Earth's Core, published in 1914, is the first book in Edgar Rice Burroughs' Pellucidar series. The story follows David Innes and his friend Abner Perry as they journey 500 miles beneath the Earth's surface using a drilling machine called an 'iron mole.' This novel introduces the fictional Hollow Earth setting of Pellucidar, characterized by prehistoric creatures and primitive societies, marking a significant contribution to the adventure and science fiction genres.