Peru will submit a $132.5 million plan to the United Nations' cultural body to preserve the famous Inca citadel, Machu Picchu, from the ravages of tourism and avoid losing its status as a World Heritage site, a senior official said. The UN Educational, Scientific and Cultural Organization, UNESCO, warned in 2003 that it could put the stone citadel on its list of at-risk sites after experts said unrestricted tourism and landslides had damaged Machu Picchu and its surroundings. "Today we will submit the Machu Picchu Master Plan to UNESCO, as Peru undertook to preserve its heritage," Maria Elena Cordova, a senior official at the National Institute of Culture.