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Misti as seen from Arequipa

Misti is a volcano in the southern Peruvian Andes, rising above Arequipa, Peru's second-largest city. Because it is only 12 km (8 mi) from Arequipa and its million-plus inhabitants, it is considered one of the world's most dangerous volcanoes. Narrow valleys on its western and southern flanks pose particular threats, as mudflows and fast-moving flows of hot volcanic debris could be channelled into the urban area and into important infrastructure, like hydropower plants. The last two significant eruptions were 2,000 years ago and from 1440 to 1470. Even a moderate eruption could deposit volcanic ash and tephra over most of the city. A volcano observatory monitors the mountain. The Inca viewed the volcano as a threat, and during the 1440–1470 eruption offered human sacrifices (capacocha) on Misti and neighbouring mountains to placate the volcano. The mummies on Misti form the largest known Inca human sacrifice. (Full article...)