This uninhabited mining town in Chile is a colourful ghost town that was built in 1905 to house workers as it was to become the world's largest underground copper mine El Teniente. It's known as the city of stairs as it was built on terrain too steep for wheeled vehicles so there are no roads and there was just a train that brought workers to the camp. Sewell has been preserved as a monument to its workers and their way of life. Its distinctive buildings in vivid colours are the main attraction.