Journey to the Centre of the Earth by Jules Verne is a classic story by the man some consider the father of science fiction. Professor Lindenbrock, a famous geologist, rushes home one evening ecstatic over his latest discovery of a very old Icelandic manuscript at the local book store. His excitement increases as a piece of parchment written in code falls out of the book. Once decoded the professor is determined to follow in the footsteps of its author and journey to the center of the Earth dragging his rather reluctant nephew along for the expedition. They journey to Iceland where they hire a guide to take them into the crater of an extinct volcano. Then the descent begins. They take wrong turns, get separated, and run low on supplies for a time; yet they continually overcome each new difficulty, press on their way, and are astounded by the marvels they encounter along the way.
It's great classic work for age 10 and up. Some of the geology and description can be a bit tedious at times, but their is plenty of adventure to move the story along. Definitely worth the effort to read.