Stonehenge and other megaliths. Cave paintings in France. Maybe some natural phenomenon like Giant’s Causeway. Even ancient Greek ruins since people bring up aliens when talking about much more recent structures in the global south like Mexico or SEA.

Correct. European buildings are just not as old as for example the pyramids. This has nothing to do with racism.

Edit: Oh and for example in case of stonehenge, people also believe it was build by aliens, even though it‘s in Europe.