Ok lets consider this as a maybe possibility, lets say that a long time mars did inhabit intelligent life, but a global disaster ruined there planet, most of there species died but the remaining few travlled to earth, when they landed here they saw apes, they knew that these animals have the potential to be highly intelligent. So they injected the apes with some of there DNA to help them along evolution, as we evolved we have half alien DNA, lets say that these aliens where peaceful, humanity isnt peacful as a whole because we only inherited half of there DNA and we still have a primitive instinct to kill and protect, just as we share love and compasion for each other. Possibility???

Below are some interesting pictures.
Mars pyramid?
http://uforc.com/images010306/MarsPy...geM0701415.jpg
http://www.aliendave.com/files/Photo...connectMAP.jpg
http://www.enterprisemission.com/ima...s/moc-city.jpg
http://www.greatdreams.com/sample_tunnel.jpg A glass tunnel maybe to transport water from the poles