So, let’s try and “solve” the mystery around Machu Picchu by learning more about it. Machu Picchu is a 15th-century Inca citadel. Most archaeologists believe that Machu Picchu was constructed as an estate for the Inca emperor Pachacuti (1438–1472). Machu Picchu is more than 7,000 feet above sea level in the Andes Mountains. Machu Picchu is made up of more than 150 buildings ranging from baths and houses to temples and sanctuaries.