Machu Picchu is 400 meters above Aguas Calientes. It’s the #1 tourist attraction of South America. It’s an Inca city on top of a mountain, nestled between two other mountains in an incredibly scenic way, as if the Inca designed it as a tourist attraction 700 years ago. The Spaniards who looted the rest of the continent never found it.
We got up there early in the morning, but for the first two hours we saw exactly nothing because of dense fog. I suppose there’s a reason the forests up here are called fog forests. The buildings all lost their roofs but were otherwise intact, and we explored the city for hours. They let tourists roam freely, except where guards are posted; they create tiny one-way zones around them.