If there were only six wonders of the ancient world, they would be the Great Pyramid, the Statue of Zeus, the Temple of Artemis, the Colossus of Rhodes, the Alexandria lighthouse and the mausoleum at Halicarnasus.

The Hanging Gardens of Babylon is the only one of the seven ancient wonders that is not known to have existed. Some historians believe they were mythical, while others believe it is likely the garden of the Assyrian king Sennacherib that is mistakenly referenced as being in Babylon. In any case, it is quite likely that the Babylonian gardens did not exist as cited, and therefore it would be left off the list if one is to identify only six wonders.
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