I can share one perspective on this topic. The school of thought which believes in the existence of extraterrestrial is of the view that these wonders were built by people from some other planet who were advanced enough to have travelled to Earth and make it their station. After gauging these structures in relevance to the history of the evolution of man, it just does not seem possible that they could have been constructed by humans. It's not just the astronomical aspect alone which supports this thought but also the aeronautical advancement influencing such developments. The best evidence in this respect can been seen at Baalbek, Lebanon, where a huge platform was constructed in ancient times with stones weighing hundreds of tons - an accomplishment very difficult to duplicate even today with all the modern technology. Mythology links this sacred site of Baalbek with the sun god Helios, who parked his chariot on this platform. There are the Nazca Lines in Peru, properly visible from the air, which also tells of a similar legend. All these structures and their similarity to the ones on Mars lead to the question whether the aeronautical technology of the gods included space travel. In 1976, an American author, Zecharia Sitchin, gave proof that the gods were indeed space travellers and also that the Earth was once visited by the Anunnaki (literally meaning "Those who from heaven to earth came").The evidence as to where these aliens came from continues to point to the mysterious Planet X, the tenth planet of the solar system. Despite various governments' attempts to disregard its presence, many astronomers believe that it exits because of the anomalies that have been recorded in the orbits of the outer planets. Due to its highly elliptical 3600-year orbit, it has not been possible to visually confirm the existence of Planet X. In his book The Twelfth Planet, Sitchin deciphered an ancient clay planisphere from the British Museum, which presented a route map of the people from Planet X to Earth. Their journey through the solar system to the earth was commemorated in an ancient Babylonian ritual called the "procession of Madruk." It was only after thorough research that Sitchin realized that Babylonians had named Planet X as Madruk, and after that he was able to decipher their route map.
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