Aliens could be observing the ancient wonders of Earth.
Aliens could be watching Earth from afar
Scientists are convinced that clever extraterrestrials could be able to pick out buildings from other planets - but from 3,000 years ago due to the vast amount of time it takes light to cross the universe.
Zaza Osmanov, from the Search for Extra-Terrestrial Intelligence Institute, has argued that aliens might be using large telescopes to view structures of the major historical civilisations - including the Greeks, Romans and Egyptians.
He explained: "Since the question is to identify our society with civilisation, the major focus should be on the search for large ships, buildings and space satellites.
"Such artefacts might easily be identified as artificial constructions."