At Chile's northernmost end, the dizzying railway from high Bolivia comes down to the sea. Arica, the City of Eternal Spring, has a population of 169,000. and is located in the Atacama Desert. See San Marcos Cathedral, designed by Gustave Eiffel, and marvel at Pre-Incan relics in the City Museum. Or leave the city to venutre to the White City of Arequipa, the Incan capital of Cuzco and Machu Picchu and the ancient Inca city in the clouds.