Cyclopean walls (haphazard stacks of boulders) are what most Europeans think of as “stone walls” so ones that aren’t just loose piles of rocks are pretty impressive by that standard.

The coolest part is really that they’re so complexly fitted without mortar - which allows for stone constructions to survive in an earthquake prone region. The stones can slip past each other without losing their place relative to each other when jostled, which is why Incan stoneworks like this are still standing when all the stuff the murdering bastards Spaniards built have long since collapsed.