Cusco, once imperial seat of the mighty Incan empire, is now home to a population of 300,000 and is the bustling, jumping off point for tourists heading to the Inca Trail, Machu Picchu and other Incan ruins in the region. At an altitude of 3,500 metres it was ironically found to have the highest levels of ultraviolet light on earth by a study in 2006 - interesting given the Incas fascination with the sun. Rising to prominence in the 11th Century, Cusco became the capital of the burgeoning Incan empire and with its fertile valleys, abundant glacial water supply and central
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