About 30 miles outside Mexico City sits magnificent Teotihuacan, a collection of pyramids that wouldn’t look out of place on an Indiana Jones set. The ancient city existed between 100 B.C. and 650 A.D., or nearly a thousand years before the Aztecs. At its zenith, more than 100,000 people called it home—a mashup of Maya, Mixtec, and Zapotec cultures. Only 5 percent of the 8-square-mile site has been excavated, but in poking around the Pyramid of the Moon, archaeologists discovered many a headless human and animal—most likely sacrifices to the gods. Bones, skulls, and teeth abound in the macabre on-site museum, whose entrance fee is included in the 64 pesos ($3.68 USD) admission. Go early and slather on sunblock; there is nowhere to hide from the afternoon heat and crowds.