Professor Hardwigg discovered an old Icelandic parchment that contained a map to the center of the earth. The professor was determined to follow the map with his nephew and a guide from Iceland as traveling companions.
Their journey was perilous and at several points almost ended in death, yet they succeeded and reached their destination.
They found the center of the earth contained a unique ecosystem, complete with vegetation, water, massive creatures, and even what appeared to be giant humans.
There were some interesting parts in the book. However, it seemed a bit far fetched and I found it difficult to get into the story.