We’ll leave Cajamarca and drive along a winding road through spectacular scenery to the Archaeological Complex of Cumbemayo. As we approach the site, you’ll soon see the towering volcanic pillars, which, over the centuries, have been cut by wind and rain into strange anthropomorphic shapes. The most famous of these are Los Frailones (“The Friars”), named by locals due to their resemblance to a procession of monks.

As we walk to the aqueduct, we’ll...