Machu Picchu, now one of the seven wonders of the world, is a small city in the Andes. Sapa Inca Pachacuti built Machu Picchu in the mid-15th century. It appears to have been a sacred, ceremonial city and an astronomical observatory. The largest park in Machu Picchu , called Huyana Picchu, is known as " hitching past of the sun". Most of the roughly 150 buildings in Machu Picchu were built of granite so their ruins look like part of mountains. The Inca made regular blocks of granite fit so tightly together that there are areas where a knife cannot fit between the stones. Yale archaeologist Hiram Bingham discovered the ruins of the city in 1911.
