In the profound silence of the cosmos, a provocative question lingers: if we are not alone, do our celestial neighbours also look to the heavens for meaning? While the search for extraterrestrial ...

They were not, so the polemic went, the work of 'puny' man, but instead those 'giants of Mars'. Yes, the Pyramids of Giza - those monuments to god-like splendour that have stood for more than 4,000 ...

Giorgio A. Tsoukalos talks about the Alien Astronaut Theory & the new episodes of "Ancient Aliens" on The History Channel.