It is believed Machu Picchu was created around 1450, but was abandoned barely a century later, in 1572.
Machu Picchu is situated at a great height, offering greater security to its original inhabitants - the Incan Empire.
Pachacuti was the ninth Sapa Inca (ruler) of the Incan Empire. It is believed Machu Picchu was built for him.
There is plenty to see at Machu Picchu! Inti Watana is a ritual stone which is a popular sight.
"Machu Picchu" comes from the Quechua language and means "old peak." Quechua was the main language of the Incans.
The site is restricted to 2,500 visitors a day due to concerns about damage. Only 400 people a day can enter Huayna Picchu (the famous peak facing Machu Picchu).
The Inca Empire had a population of around 10 million in the early 16th century. It was a huge and powerful empire at the time.
Or 2,000,000 sq km - the Incan Empire covered all or parts of modern Peru, Ecuador, Bolivia, Chile, Argentina and Colombia.
This American explorer made Machu Picchu public to the world. Before he visited the citadel in 1911, it had been mostly forgotten by the outside world.
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