- Secrets in the Fields: The Science and Mysticism of Crop Circles
- First Templar Nation: How Eleven Knights Created a New Country and a Refuge for the Grail
- The Lost Art of Resurrection: Initiation, Secret Chambers, and the Quest for the Otherworld
- Common Wealth: The Origin of Places of Power and the Rebirth of Ancient Wisdom
- Portals: Energetic Doorways to Mystical Experiences Between Worlds