Inca Bridge Inca Bridge The Inca Bridge or Inka Bridge refers to one of two places related to access to Machu Picchu, in Peru. One of the two was built by the Incas as a secret entrance to Machu Picchu for the Inca army. This Inca Bridge is a part of a mountain trail that heads west from Machu Picchu. The trail is a stone path, part of which is cut into a cliff face. A twenty-foot gap was left in this section of the carved cliff edge, over a 1,900-foot drop, that could be bridged with two tree trunks, otherwise leaving
Machu Picchu more farmland to grow crops, and to steepen the slopes that invaders would have to ascend. The terraces reduced soil erosion and protected against landslides. Two high-altitude routes from Machu Picchu cross the mountains back to Cusco, one through the Sun Gate, and the other across the Inca bridge. Both could be blocked easily, should invaders approach along them. The site is roughly divided into an urban sector and an agricultural sector, and into an upper town and a lower town. The temples are in the upper town, the warehouses in the lower. The architecture is adapted to the mountains.