El Misit towers over the Peruvian town of Arequipa with a solemn menace. It last erupted in 1985 and it isn’t hard to see why the Incans thought it to be a holy place. So far six mummies and various other artefacts of human sacrifice have been recovered from its summit. Archaeologists believe that the children were sacrificed as part of a Capac Cocha ceremony aimed at appeasing the apus, or mountain gods.