The story that the planet Earth is hollow is represented in the history of many diverse cultures throughout the world. The Avalon of Camelot, the Garden of Eden, Paradise Lost, Shangri-La and Valhalla are names assigned to a mystical and physical place thought by some to house prehistoric animals and plants and by others to hide alien beings bent on conquering the outer Earth. This fascinating video is a compilation of the extensive research and amazing facts surrounding this age-old mystery. • 30 min •.