The Inca Bridge or Inka Bridge refers to one of two places related to access of Machu Picchu, in Peru. One of the two was built by the Incas as a secret entrance to Machu Picchu for the Inca army.
The Inca Bridge (trunk bridge ) :
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 feet drop, that could be bridged with two tree trunks, otherwise leaving the trail impassable to outsiders.
The Inca Bridge (rope bridge) :
This Inca Bridge was an ancient Inca rope bridge out of Machu Picchu, crossing the Urubamba River south-east of Cusco in the Pongo de Mainique. It no longer exists. But it was made of dried grasses and wood.