Visit Peru's must-see attractions and explore World Heritage sites in the capital, Lima, and in Cusco. | Explore the Amazon Rainforest, known as the lungs of the world, visit Machu Picchu, one of the New Seven Wonders of the World, and uncover the mysteries of the Sacred Valley, the heart of the Inca Empire. | Take a boat tour of Lake Titicaca, the world's highest navigable lake.