Machu Picchu Base Admiralty Bay. Machu Picchu Base conducts annual scientific expeditions to Antarctica. The base carries out a variety of scientific projects such as research into krill and its potential as an alternative human food source, as well as geological, biological, hydrographic, and geophysical research, under the provisions of the Antarctic Treaty. The base operates radar measuring upper atmospheric winds, and supplying data on the deterioration of the ozone layer. As Antarctica is a continent of valuable strategic, ecological, and economic importance, Peru has an interest in maintaining its status as a non-militarized, nuclear-free zone of peace, and in preserving its environment,
History of architecture most of the western length of the continent. Inca rope bridges could be considered the world's first suspension bridges. Because the Incas used no wheels (It would have been impractical for the terrain) or horses, they built their roads and bridges for foot and pack-llama traffic. Much of present-day architecture at the former Inca capital Cuzco shows both Incan and Spanish influences. The famous lost city Machu Picchu is the best surviving example of Incan architecture. Another significant site is Ollantaytambo. The Inca were sophisticated stone cutters whose masonry used no mortar. Inside what is the present-day United States, the