Except the distance to travel and the why they would. Also, there's the lack of evidence. So it's not impossible to believe, but it is more difficult to believe. Maybe we're the apes that teach the other apes rather than vice versa.
BTW, Colossus at Rhodes, Hanging Gardens of Babylon, Mausoleum at Halicarnassus, Great Lighthouse of Alexandria, Temple of Artemis, and Statue of Zeus. Those are six of the seven wonders of the Ancient World. None of them exist anymore. So it's not really all that helpful to talk about lasting achievement of the ancients.