 Reinhard is famous for his discoveries of Inca mummies, including Mummy Juanita and frozen sacrifices on the peaks of the Andes in Peru and Argentina.He also has explored the sacred valleys of the Himalayas and performed underwater archaeology in some of the world's highest lakes.His investigations have led him to present theories to explain the mystery of the Nazca Lines (the giant desert drawings), pre-Hispanic ceremonial sites built on Andean mountain summits, and the ancient ceremonial centers of Machu Picchu, Chavin, and Tiahuanaco.