Inca road system
By far the most popular of the Inca trails for trekking is the Capaq Nan trail, which leads from the village of Ollantaytambo to Machu Picchu, the so-called "Lost City of the Incas". There are many well-preserved ruins along the way, and hundreds of thousands of tourists from around the world make the three- or four-day trek each year, accompanied by guides.