Peter Frost is a writer, photographer, archaeologist, and National Geographic grantee who has spent much of his life exploring Peru. His published works include guides to the Cusco region and a local book on Machu Picchu. In 2001 and 2002, Peter led National Geographic-sponsored archaeological expeditions into the remote region of Vilcabamba, where he discovered the Inca and pre-Inca site of Qoriwayrachina (National Geographic magazine, February 2004). Peter has lived in Peru since 1987.