Aliens and UFOs in prehistory

In fact find "evidence" of the presence of other advanced beings on our planet, from ancient times. In the Sahara, south of the mountains of Tassili, Algeria. For example, the remnants of old wells and shelters are more than five thousand paintings.

Henri Lhote was the first to explore, in 1933, and baptized with the name "the Martians." The wall paintings of Tassili, located on a sandy shelf of 800 km long by 60 wide, containing detailed information on the life of prehistoric man. Reproducible animals with great fidelity, also men in hunting scenes, but alongside them strange beings of huge round head fitted with a single eye.

Some skeptics suggested that it was empty gourds with men on their shoulders satisfy some primitive ritual, that theory is unfounded by the fact that never was cultivated this fruit in the heights of the plateau of Tassili.

Who were these people? Why keep such a resemblance to modern cases of extraterrestrial contact? The gods of Tassili are homonyms in other Nart of the world.
In Australia, Spain, France ... but the legacy alive of those paintings are found in northern Africa, embodied in the tribe of the Dogon.