- About.com: Hollow Earth
 - Theories, explanations, explorations, and drawings related to the Hollow Earth theory. Includes analysis of Nazi involvement and the possibility that aliens live inside the Earth. - Hollow Earth Theory, Article #718
- Brief and critical explanation of the Hollow Earth theory from the Geophysical Institute, University of Alaska Fairbanks.
- Hollow Earth: Fact or Fiction
- Includes a diagram of the Earth by Raymond Bernard and images from space.
- Hollow Planets
- Directory of writings on the Hollow Earth theory. Includes pictures from Planet Zero.
- UnMuseum, The: The Hollow Earth
- Examines the theory which was initially proposed by Edmund Halley in 1692.
- World Top Secret: Our Earth Is Hollow
- By Rodney M. Cluff. Examines the theory that the Earth, Moon, and planets could be hollow bodies and possibly inhabited from within.
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