Machu Picchu, situated on a narrow ridge between the Huayna Picchu and Machu Picchu peaks in the Peruvian Andes, is perched 7,970 feet above sea level on a massive structural block of white granite, a plutonic igneous rock composed of quartz, feldspar, and mica. 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.
Johan Reinhard believes Machu Picchu to be a sacred religious site. This theory stands mainly because of where Machu Picchu is located. Reinhard calls it “sacred geography” because the site is built on and around mountains that hold high religious importance in the Inca culture and in the previous culture that occupied the land.
The central buildings of Machu Picchu use the classical Inca architectural style of polished dry-stone walls of regular shape. The Incas were masters of this technique, called ashlar, in which blocks of stone are cut to fit together tightly without mortar. Many junctions in the central city are so perfect that it is said not even a blade of grass fits between the stones.
How they moved and placed the enormous blocks of stones remains a mystery, although the general belief is that they used hundreds of men to push the stones up inclined planes. A few of the stones still have knobs on them that could have been used to lever them into position; it is believed that after the stones were placed, the Incas would have sanded the knobs away, but a few were overlooked.
Today, tens of thousands of tourists walk the Inca Trail to visit Machu Picchu each year. They acclimate at Cusco before starting on the two- to four-day journey on foot from the Urubamba valley, walking up through the Andes mountain range to the isolated city. Source: Wikipedia
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