On the surface of Mars lies a formation that looks remarkably like a humanoid face. Forever staring up into the vastness of space it has attracted our attention. For some, that is why it is there, beckoning us to come and explore. Others believe that it is simply an odd looking geological landform - a formation carved over the ages by the random forces of nature. It is our imagination and our desire to find other life in the universe that makes us see it as an intelligently crafted object. Opinions about the possibility of life on Mars have changed over the years from Percival Lowell"s canals, to the dead planet image by the early Mariner missions to Mars, to the enormous volcanoes, great canyon systems, and channels carved by water seen by Mariner 9 and Viking. In the first edition of The Martian Enigmas, Dr. Mark J. Carlotto presented a detailed analysis of the controversial Viking photographs. The revised edition greatly expands on his early work, containing new research results that add further support to the claim that these objects may be precisely what many scientists have sought for decades: the first hard evidence that we are not alone.