Could Shambhala exist within our Earth? From Tibetan legends of Shangri-La and stories of Agartha, explore the mysteries of hollow (or concave, or inner) Earth with scholar and researcher Andrew Gough. Learn accounts of green children and the Knights Templar as Gough presents evidence ranging from declassified CIA documents and centuries-old scientists like Edmond Halley to legends like author Jules Verne and Admiral Byrd.