The main content of geocentric travel notes is less than 3 words.

The book Journey to the Center of the Earth tells that Professor Lidenblock accidentally got a parchment in an ancient book and found that his predecessors had traveled to the center of the earth. Professor Lidenblock was determined to do the same. He and his nephew set out from Hamburg and invited a guide to Iceland. They followed the guidance of their predecessors and descended from a crater in Iceland. On the way, they experienced hardships and wonders. After going through all kinds of dangers such as getting lost, water shortage and prehistoric creatures, I also got amazing discoveries such as prehistoric human bones in the underground sea. After three months of travel, I finally returned to the ground.