A worker ties a bag of salt in a pool at the Maras mines in Cuzco July 3, 2009. The Maras mines have been a source of salt since ancient pre-Incan civilizations and nowadays comprise about 3,000 small pools constructed on the slope of a mountain at the Urubamba valley in the Andean region of Cuzco. Reuters Pictures 4 months ago

A worker ties a bag of salt in a pool at the Maras mines in Cuzco July 3, 2009. The Maras mines have been a source of salt since ancient pre-Incan civilizations and nowadays comprise about 3,000 small pools constructed on the slope of a mountain at the Urubamba valley in the Andean region of Cuzco.