Watch A Visit to the Underground Cities of Mars (1977) : Full Movie Online Free Take a psychic voyage and see for yourself the underground cities of Mars! Our neighbors on Mars have developed a peaceful lifestyle that is technologically and spiritually far in advance of our own. This amazing film, completed before the Viking lander’s photographs revealed what appear to be the remains of an ancient civilization on the surface of Mars, portrays beautiful underground cities. Discover how the Martians learned to live in peace and harmony.