Journey to the Center of the Earth is a classic science fiction adventure novel by Jules Verne. It tells the story of a German professor, Otto Lidenbrock, who believes that there are volcanic tubes leading to the center of the Earth. He, his nephew Axel, and their guide Hans set out on an expedition to find these tubes and travel to the Earth's core. Along the way, they encounter many dangers and adventures, including prehistoric animals, natural hazards, and even an underground sea. Eventually, they reach the center of the Earth and discover a vast, sunlit cavern inhabited by a race of giant humans.