Cusco (Qosqo in Quechua) means "navel of the world" and is one of the most extensive regions of Peru. Tourism is its main source of income, due to the great archaeological wealth left by the Tahuantinsuyo Empire and the passage of the Spaniards. It preserves the most important monuments of Peru and America, including Machu Picchu, Sacsayhuamán, Ollantaytambo, Písac, Kenko and Tambomachay, as well as colonial treasures such as the Cathedral Basilica.