LIMA, Peru — Peruvian officials have announced a plan to construct an elevator to access the famed "lost city" of the Incas, Machu Picchu, in an effort to bolster tourism to the No. 1 visited site in South America. The regional tourism board for the Department of Cusco — DIRCETUR-Cusco — floated the project as part of its Regional Strategic Plan drawn up last year and completed in February. Image Photo: C.J. Schexnaydere Access to Peru’s famous Machu Picchu ruins is via a dusty dirt road that ascends almost 1,500 feet from the Urubamba River to the ridge where the
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.