Machu Picchu, the ancient Incan city, stands as a testament to the architectural and engineering prowess of the Inca civilization. Perched between the Andean peaks, it was built without the use of mortar, relying on precise stone-cutting to create walls that have withstood centuries. Its function remains a topic of scholarly debate, but its alignment with astronomical events suggests it held religious significance. Today, it's a UNESCO World Heritage site and one of the New Seven Wonders of the World, attracting visitors from around the globe.