Hollow Earth Map Notebook / Journal. Notebook with the map of the hollow earth. Hollow world map. There is a theory that the earth is actually hollow and inhabited, with entrances at the Noth and South poles and more places like the Kentucky Mammoth caves and the pyramids of Giza. The hollow earth or Agharta has a city called Shamballa. There supposedly is also an inner sun. The famous astronomer Edmond Halley in 1692[20] put forth the idea of Earth consisting of a hollow shell about 500 mi thick, two inner concentric shells and an innermost core, about the diameters of the planets Venus, Mars, and Mercury. The inner earth - my secret diary by Admiral B. Byrd tells of his trip to the poles, he supposedly flew into the north pole entrance and met with an unknown race of people living there. Described by Jules Verne - The Journey To The Center of The Earth, Edgar Rice Burroughs - At the Earth's Core and Indiana Jonas and the hollow earth. Blank pages, glossy finish. Cool statement notebook for Hollow Earthers. By Kickazz Notebooks