The Sacred Magic of Ancient Egypt: The Spiritual Practice Restored, Llewellyn, 2003

The Sacred Tradition of Ancient Egypt: The Esoteric Wisdom Revealed, Llewellyn, 2000

The Science of the Dogon: Decoding the African Mystery Tradition, Inner Traditions, 2006

The Secret Architecture of Our Nation’s Capitol: The Masons and the Building of Washington DC, HarperCollins, 2000

The Secret Chamber: The Quest for the Hall of Records

The Secret Geometry of the Dollar: The Secret Geometry and Mathematical Tradition of the 1935 Dollar, AuthorHouse, 2005

The Secret History of the Mongol Queens: How the Daughters of Genghis Khan Rescued His Empire, Broadway, 2011

The Secret Space in the White House, Virtualbookworm.com Publishing, 2017

The Secret Symbols of the Dollar Bill, HarperCollins, 2004

The Secret Teachings: Unveiling the Luminous Sun Within, Bethel Publishing, 2000