PERU: A five-year study of the famed Nazca Lines, massive geoglyphs in the Peruvian desert, took a down-to-earth approach. Archaeologists walked the paths, which are between 1,300 and 2,100 years old, to see them perhaps as their makers once saw them. Among the finds is a previously unstudied labyrinth, 2.5 miles long, hidden in plain sight, and full of disorienting twists and turns. Walking such paths single file likely had some unknown ritual purpose. —Samir S. Patel