Second time guest on Timeless Voyager Radio (circa 1994) with host, Bruce Stephen Holms, Richard C. Hoagland continues to claim that NASA is covering up the architectural ruins in the Cydonia region of Mars. Hoagland claims the "Face on Mars" is part of a city built on Cydonia Planitia consisting of very large pyramids and mounds arranged in a geometric pattern. 

Hoagland authored the book The Monuments of Mars: A City on the Edge of Forever (published in 1987), and co-authored the book Dark Mission: The Secret History of NASA, which was ranked 21st on November 18, 2007, on The New York Times Best Seller list for paperback nonfiction.

NOTE: Many of the statements made by Richard C. Hoagland are regarded as non-factual by NASA, JPL, and many from the academic and scientific communities. That doesn’t mean, however that his statements are false.

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