The Monuments of Mars: A City on the Edge of Forever
Richard C. Hoagland

In 1976, NASA sent four Viking spacecraft to Mars to photograph the planet and test for the presence of life. One of the orbiters photographed a mile-long mesa that uncannily resembled a human face. Hoagland takes readers step by step through the NASA images and evidence that a former civilization may have lived on Mars. Photos, maps, and charts.