Oman today_ Machu Picchu, the lost city of the Incas, is renowned as the most mysterious ancient city in the world, with its stone walls and distinctive architectural style. This astonishing archaeological site was discovered in 1911 by an archaeologist from Yale University in the United States. The ancient stone city of Machu Picchu is located in the highlands of the Andes Mountains and is recognized as a UNESCO World Heritage Site and one of the New Seven Wonders of the World.