In what can only be described as one of the most important archaeological and sociological discoveries in human history, The Cydonia Codex offers overwhelming evidence of aesthetic and symbolic design on the surface of the planet Mars. The authors' research encompasses over ten years of study and analysis of NASA photographs of the "Face on Mars" and its surrounding complex. Beginning with the famous 1976 photograph of a mile-long formation found on the surface of Mars that strongly resembles a human face, Haas and Saunders offer side-by-side comparisons of the art and sculpture of pre-Columbian Mesoamerica with a set of corresponding geoglyphic structures found in the Cydonia region of Mars. The implication is staggering?Earth's history and humankind's origins could be very different than commonly believed. Black-and-white photos, as well as illustrations, are featured throughout.