Peru, full machupichu

The Inca Empire, or Inka Empire (Quechua: Tawantinsuyu), was the largest empire in pre-Columbian America. The administrative, political and military center of the empire was located in Cusco in modern-day Peru. The Inca civilization arose from the highlands of Peru sometime in the early 13th century.
From 1438 to 1533, the Incas used a variety of methods, from conquest to peaceful assimilation, to incorporate a large portion of western South America, centered on the Andean mountain ranges, including, besides Peru, large parts of modern Ecuador, western and south central Bolivia, northwest Argentina, north and central Chile, and southern Colombia into a state comparable to the historical empires of Eurasia.
The official language of the empire was Quechua, although hundreds of local languages and dialects of Quechua were spoken. The Inca referred to their empire as Tawantinsuyu which can be translated as The Four Regions or The Four United Provinces.
There were many local forms of worship, most of them concerning local sacred "Huacas", but the Inca leadership encouraged the worship of Inti—the sun god—and imposed its sovereignty above other cults such as that of Pachamama. The Incas considered their King, the Sapa Inca, to be the "child of the sun."
The Inca referred to their empire as Tawantinsuyu, "four parts together." In Quechua the term Tawantin is a group of four things (tawa "four" with the suffix -ntin which names a group). Suyu means "region" or "province". The empire was divided into four suyus, whose corners met at the capital, Cusco (Qosqo). The name Tawantinsuyu was, therefore, a descriptive term indicating a union of provinces. The Spanish transliterated the name as Tahuatinsuyo or Tahuatinsuyu which is often still used today.
The term Inka means ruler, or lord, in Quechua, and was used to refer to the ruling class or the ruling family in the empire. The Spanish adopted the term (transliterated as Inca in Spanish) as an ethnic term referring to all subjects of the empire rather than simply the ruling class. As such the name Imperio inca (Inca Empire) referred to the nation that they encountered, and subsequently conquered.
The Inca people were a pastoral tribe in the Cuzco area around the 12th century. Under the leadership of Manco Cápac, they formed the small city-state Kingdom of Cuzco (Quechua Qusqu'Qosqo). In 1438, they began a far-reaching expansion under the command of Sapa Inca (paramount leader) Pachacuti-Cusi Yupanqui, whose name literally meant "earth-shaker". The name of Pachacuti was given to him after conquering over the Tribe of Chancas (modern Apurímac). During his reign, he and his son Tupac Yupanqui brought much of the Andes mountains (roughly modern Peru and Ecuador) under Inca control.   

Machu Picchu, Quechua: Machu Pichu, "Old Peak") is a pre-Columbian 15th-century Inca site located 2,430 metres (7,970 ft) above sea level.  Machu Picchu is located in the Cusco Region of Peru, South America. It is situated on a mountain ridge above the Urubamba Valley in Peru, which is 80 kilometres (50 mi) northwest of Cusco and through which the Urubamba River flows. Most archaeologists believe that Machu Picchu was built as an estate for the Inca emperor Pachacuti (1438–1472). Often referred to as the "Lost City of the Incas", it is perhaps the most familiar icon of the Inca World.
The Incas started building the "estate" around AD 1400, but abandoned it as an official site for the Inca rulers a century later at the time of the Spanish Conquest. Although known locally, it was unknown to the outside world before being brought to international attention in 1911 by the American historian Hiram Bingham. Since then, Machu Picchu has become an important tourist attraction. Most of the outlying buildings have been reconstructed in order to give tourists a better idea of what the structures originally looked like. By 1976, thirty percent of Machu Picchu had been restored. The restoration work continues to this day.
Since the site was never known to the Spanish during their conquest, it is highly significant as a relatively intact cultural site. Machu Picchu was declared a Peruvian Historical Sanctuary in 1981 and a UNESCO World Heritage Site in 1983. In 2007, Machu Picchu was voted one of the New Seven Wonders of the World in a worldwide Internet poll.
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. In September 2007, Peru and Yale University almost reached an agreement regarding the return of artifacts which Yale has held since Hiram Bingham removed them from Machu Picchu in the early 20th century. In November 2010, a Yale University representative agreed to return the artifacts to a Peruvian university.