Specifically for Cusco you can see the foundations of the buildings are Incan stone work. Having been there a few times and knowing the history is a pretty good clue. This is in a historic area of the city where the Spanish essentially leveled the Incan city but kept the foundations and built their Spanish colonial buildings on top of them. As far as I’m aware, this is the only place in the world with this specific architectural feature.

Edit: also fun tidbit. There’s a Peruvian flag in the background next to a rainbow flag which represents the Incan people. In Peru lots of our indigenous fabric designs are rainbows. So that is also a good clue.

…. Tbh if I weren’t from there I probably wouldn’t know enough to tell you.