Cusco
Cusco once served as the heart of the Inca Empire, and that legacy still shapes every corner of the city even as it serves as a gateway to Machu Picchu. Outside the historic center, the ruins of Sacsayhuamán overlook the city from a nearby hilltop. This ceremonial complex is best known for its massive zigzag stone walls, some weighing over 100 tons. During the Inti Raymi festival in June, thousands gather here to reenact ancient Andean rituals.