Inca Roads.

The Inca road system in the vicinity of Machu Picchu utilizes a wide variety of native technologies to meet enormous challenges and to achieve defined objectives. Slope stabilization, drainage, retaining walls, stairways, viewing stations, controlled access, guardhouses and platforms, rest stops, and water supplies for the traveler all add up to spectacular success by the ancient Inca road builders. WPI studied Inca road design, contributing to an exhibit at the Smithsonian Institution’s National Museum of the American Indian.