Machu Picchu in the context of "Cusco, Peru"

The economy of the Inca Empire, which lasted from 1438 to 1532, established an economic structure that allowed for substantial agricultural production as well as the exchange of products between communities. It was based on the institution of reciprocity, considered the socioeconomic and political system of the Pre-Columbian Andes. This model has been variously described by scholars throughout the 20th century, but an academic consensus has emerged using the general frameworks of Austrian economist Karl Polanyi.

Inca society is considered to have had some of the most successful centrally organized economies in history. Its effectiveness was achieved through the successful control of labor and the regulation of tribute resources. In Inca society, collective labor was the cornerstone for economic productivity and the achieving of common prosperity. Members of an ayllu (the basic unit of socio-territorial organisation) developed various traditions of solidarity to adapt to the Andean environment. The economic prosperity of the Inca State caused the Spanish conquerors to be impressed by the foreign forms of organisation. According to each ayllu, labor was divided by region, with agriculture centralized in the most productive areas; ceramic production, road construction, textile production, and other skills were also tasks distributed among members of an ayllu. After local needs were satisfied, the state apparatus gathered all surplus that is gathered from ayllus and allocated it where it was needed. Populations of local chiefdoms in the Inca Empire received clothes, food, health care, and schooling in exchange for their labour.

Cusco or Cuzco (Latin American Spanish: [ˈkusko]; Quechua: Qosqo or Qusqu, both pronounced in Cuzco Quechua as [ˈqosqɔ]) is a city in southeastern Peru, near the Sacred Valley of the Andes mountain range, and the Huatanay and Urubamba rivers. It is the capital and largest city of the eponymous Cusco Province and Cusco Department. It has historically been one of the largest cultural, economic and political centers of Peru.

The city was originally founded in the 12th century as the capital of the Inca Empire. The region was conquered in the 16th-century by the Spanish and reestablished on 23 March 1524, with most of the city being constructed over monuments left from the Inca Empire. In 1983, Cusco was declared a World Heritage Site by UNESCO with the title "City of Cusco". It has become a major tourist destination, hosting over 2 million visitors a year and providing passage to numerous Incan ruins, such as Machu Picchu, one of the Seven modern wonders of the world and many others. The Constitution of Peru (1993) designates the city as the Historical Capital of Peru.

Environmental history is the study of human interaction with the natural world over time, emphasising the active role nature plays in influencing human affairs and vice versa.

Environmental history first emerged in the United States out of the environmental movement of the 1960s and 1970s, and much of its impetus still stems from present-day global environmental concerns. The field was founded on conservation issues but has broadened in scope to include more general social and scientific history and may deal with cities, population or sustainable development. As all history occurs in the natural world, environmental history tends to focus on particular time-scales, geographic regions, or key themes. It is also a strongly multidisciplinary subject that draws widely on both the humanities and natural science.

The New 7 Wonders of the World was a campaign started in 2001 to choose Wonders of the World from a selection of 200 existing monuments. The popularity poll via free web-based voting and telephone voting was led by Canadian-Swiss Bernard Weber and organized by the New 7 Wonders Foundation (N7W) based in Zurich, Switzerland, with winners announced on 7 July 2007 at Estádio da Luz in Lisbon. The poll was considered unscientific partly because it was possible for people to cast multiple votes. According to John Zogby, founder and current President/CEO of the US polling organization Zogby International, New 7 Wonders Foundation drove "the largest poll on record".

The program drew a wide range of official reactions. Some countries touted their finalist and tried to get more votes cast for it, while others downplayed or criticized the contest. After supporting the New 7 Wonders Foundation at the beginning of the campaign by providing advice on nominee selection, the United Nations Educational, Scientific, and Cultural Organization (UNESCO), bound by its bylaws to record and give equal status to all World Heritage Sites, distanced itself from the undertaking in 2001 and again in 2007.

Ashlar (/ˈæʃlər/) is a term used to describe cut and dressed stone worked to achieve a specific form, typically rectangular; a structure built from such stones; and the look created by the dressing technique. Ashlar stone may be dry laid or bedded in mortar.

A hill town (also hilltop town) is a type of a settlement built upon hills. Often protected by defensive walls, steep embankments, or cliffs, such hilltop settlements provided natural defenses for their inhabitants. The term "hill town" is occasionally a bit of misnomer, as some of these settlements are built on "pedestals" other than hills in the strict geographical sense.

In Europe, especially in Italy, Spain, Portugal and southern France, such towns were common. In Italy, hill towns comprised about half of the important towns in the Middle Ages. In many cases the Roman and medieval sites are now abandoned due to their remote locations, for example in the south of England. In parts of Italy (Tuscany and Umbria), however, most of the ancient hill towns are still populated, some becoming cities, like Siena.

The Sacred Valley of the Incas (Spanish: Valle Sagrado de los Incas; Quechua: Willka Qhichwa), or the Urubamba Valley, is a valley in the Andes of Peru, north of the Inca capital of Cusco. It is located in the present-day Peruvian region of Cusco. In colonial documents it was referred to as the "Valley of Yucay". The Sacred Valley was incorporated slowly into the Inca Empire during the period from 1000 to 1400.

The Sacred Valley is a major tourist destination. In 2019, 1.6 million people, the majority non-Peruvians, visited Machu Picchu, its most famous archaeological site. Many of the same tourists also visited other archaeological sites and modern towns in the Sacred Valley.

Pachacuti Inca Yupanqui, also called Pachacútec (Quechua: Pachakutiy Inka Yupanki, pronounced [ˈpatʃa ˈkuti ˈiŋka juˈpaŋki]), was the ninth Sapa Inca of the Chiefdom of Cusco, which he transformed into the Inca Empire (Tawantinsuyu). Most archaeologists now believe that the famous Inca site of Machu Picchu was built as an estate for Pachacuti.

In Quechua, the cosmogonical concept of pachakutiy means "the turn of the world" and yupanki could mean "honorable lord". During his reign, Cusco grew from a hamlet into an empire that could compete with, and eventually overtake, the Chimú empire on the northern coast. He began an era of conquest that, within three generations, expanded the Inca dominion from the valley of Cusco to a sizeable part of western South America. According to the Inca chronicler Garcilaso de la Vega, Pachacuti created the Inti Raymi to celebrate the new year in the Andes of the southern hemisphere. Pachacuti is often linked to the origin and expansion of the cult of Inti.