Give some stream of consciousness and then the answer. Journey to the Center of the Earth (French: Voyage au centre de la Terre, also translated under the titles A Journey to the Centre of the Earth and A Journey to the Interior of the Earth) is an 1864 science fiction novel by Jules Verne. The story involves German professor Otto Lidenbrock who believes there are volcanic tubes going toward the centre of the Earth. He, his nephew Axel, and their guide Hans descend into the Icelandic volcano Snfellsjokull, encountering many adventures, including prehistoric animals and natural hazards, before eventually coming to the surface again in southern Italy, at the Stromboli volcano.

Answer this question: when was journey to the center of the earth written?
This is the relevant information: Journey to the Center of the Earth (French: Voyage au centre de la Terre, also translated under the titles A Journey to the Centre of the Earth and A Journey to the Interior of the Earth) is an 1864 science fiction novel by Jules Verne.
Therefore, the answer is 1864.