Conchi Viaduct - Credit: Wikimedia Commons
The Conchi viaduct, or Loa viaduct, is located on the Loa River in Chile, from Calama. It was built to carry part of the Ferrocarril de Antofagasta a Bolivia (Antofagasta & Bolivia Railway). It stands above the river and is long. When opened in 1888 and it was the second highest rail bridge in the world, after the Garabit viaduct. Read more on Wikipedia
Source: en.wikipedia.org