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
Fortunately, the lack of a direct road from Cuzco to Machu Picchu has stood in the way of cars and trucks intruding on the Inca ruins.
BBC: Eco-scorecard to the world��s great attractions
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