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Machu Picchu and the Inca Trail in Peru similarly suffered from hordes of tourists, who brought in trash, pollution and damaged the sites.
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The most popular way to approach Machu Picchu is by hiking the famous but crowded Inca trail, but take it slow.
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Most fly directly north to see Machu Picchu and the old Inca capital at Cusco, preferring to walk the more famous 45km Inca trail.
BBC: Trekking Peru��s Santa Cruz trail
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The railway involves a natural monopoly: the only other way of getting to the ruins is a four-day hike along the Inca Trail.
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The main mode of transportation in this World Heritage site is currently a train and hiking the Inca Trail remains a popular, but regulated, option.
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In 2013, I'm tackling Antarctica, the Inca Trail Marathon (labeled the "toughest marathon in the world"), Mongolia and New Zealand and will finish on the original course of Pheidippides in Athens in November.
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Sadly, it was a feeling similar to poking your head through the sun gate at Machu Picchu and seeing the ancient ruins for the first time after four days of hiking the Inca Trail.
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The Punta Union pass is only reachable by foot or mule along the spectacular 50km Santa Cruz trail, part of which is an ancient Inca road.
BBC: Trekking Peru��s Santa Cruz trail