This breathtaking Incan citadel, nestled 7,970 feet high in the Andes Mountains, remained largely unknown to the outside world until its rediscovery in 1911. Machu Picchu showcases the Incas' masterful ashlar masonry, fitting stones so precisely that not even a knife blade can pass between them, all without using mortar. Its true purpose, whether a royal estate or sacred religious site, continues to be a captivating mystery.
