National Geographic : 1913 Apr
Photo by Hiram Bingham A TUNNEL UNDER THE MAIN ROAD: MACHU PICCHU The road from the outer world to the city of Machu Picchu was a well-made footpath about 4 feet wide. It crosses the agricultural terraces. In the place shown in the picture, the workmen had con structed a tunnel underneath this road, so as to pass more quickly from the upper to the lower terraces. Photo byHiram Bingham THE HOUSE BUILT ON AROCK: MACHU PICCHU An example of the ingenuity of this ancient race of stone cutters who were able, without theuse of mortar or cement, tobuild their houses on rocks even whenthe rocks were lying at an angle of nearly 40 degrees.