Machu Picchu is a 15th-century Inca citadel situated on a mountain ridge 2,430 metres above sea level. It is located 80 kilometres northwest of Cuzco
https://en.m.wikipedia.org/wiki/Machu_Picchu
Although known locally, Machu Picchu was not known to the Spanish during the colonial period and remained unknown to the outside world until American historian Hiram Bingham brought it to international attention in 1911.
https://en.m.wikipedia.org/wiki/Hiram_Bingham_III
Hiram Bingham was an American academic, explorer and politician. He made public the existence of the Inca citadel of Machu Picchu in 1911 with the guidance of local indigenous farmers. Most archaeologists believe that Machu Picchu was constructed as an estate for the Inca emperor Pachacuti (1438–1472)
https://en.m.wikipedia.org/wiki/Pachacuti
The Inca Empire also known as the Incan Empire and the Inka Empire, was the largest empire in pre-Columbian America and possibly the largest empire in the world in the early 16th century
https://en.m.wikipedia.org/wiki/Inca_Empire
