NAZCA, PERU—Archaeologists Clive Ruggles of the University of Leicester and Nicholas Saunders of the University of Bristol spent five-year studying Peru's Nazca Lines, including an elaborate labyrinth, walking along its paths and examining data collected through satellite digital mapping. They think the geoglyphs were created for walking by a few people at a time, probably for a spiritual or ritual purpose. “The labyrinth is completely hidden in the landscape, which is flat and virtually featureless. As you walk it, only the path stretching ahead of you is visible at any given point. Similarly, if you map it from the air its form makes no sense at all,” Ruggles explained.