A doorway cut with great precision into the face of a rocky mountain in Peru may be one of the world's greatest mysteries.

A doorway cut into a rock face in Peru that some speculate has links to extraterrestrial life remains a great mystery to ...

The energetic archaeologist believes that Caral may also answer nagging questions about the long-mysterious origins of the Inca, the civilization ... the seat of the gods and the home of man.” ...