Train from Potrerillos mine to Diego de Almagro, Chile (© Jean-Marc Frybourg/Rex Features)

【November 24 2014】Until recently, cargo trains made regular stops along this mountain pass through the Andes, carrying copper and sulfuric acid from the now-abandoned mines in Potrerillos, Chile.Explore breathtaking Gallery from the HuluTrip homepage over the past 5 years..