The Centro Historico de Cusco, Cusco's City Square, is continually ranked as one of the most beautiful squares in the world. It's no wonder why, with layers of rich Spanish colonial architecture atop Incan walls and ruins. Each Sunday in the square, the Cuscovian people enjoy a parade and festival that is not to be missed. Cusco is filled with backpackers and tourists from around the globe. At 11,152 feet above sea level, this mountain town is the acclimatization point as well as the gateway to the ancient citadel of Machu Picchu.