Machu Picchu was built in the classical Inca style, with polished dry-stone walls. Its three primary structures are the Intihuatana(Hitching post of the Sun), the Temple of the Sun, and the Room of the Three Windows. These are located in what is known by archaeologists as the Sacred District of Machu Picchu.
Machu Picchu is vulnerable to threats from a variety of sources. While natural phenomena like earthquakes and weather systems can play havoc with access, the site also suffers from the pressures of too many tourists. In addition, preservation of the area’s cultural and archaeological heritage is an ongoing concern. Most notably, the removal of cultural artifacts by the Bingham expeditions in the early 20th century gave rise to a long-term dispute between the government of Peru and the custodian of the artifacts.