It was agreed in Brookings in the early '50s that no sign of previous civilizations in our Sol System will be allowed out. More interesting than a cave.. are the ancient CITIES on Mars, photographed by nasa THEMIS in the mid 80s. The U of AZ tasked with this project tried to hide the data, but Hoagland had already downloaded the original data here.. ''THEMIS Infra-red images of Cydonia ''Ghost Town... and The Darkness by Richard Hoagland from EnterpriseMission website. @@