Langwieser Viaduct

The Langwieser Viaduct is a single track reinforced concrete railway bridge spanning the Plessur River and the Sapünerbach, near Langwies, in the Canton of Graubünden, Switzerland.

It was designed by Hermann Schürch and constructed between 1912 and 1914 by Eduard Züblin for the Chur–Arosa railway. At the time of its completion, the Langwieser Viaduct was the first railway bridge anywhere in the world to possess a span of 100 meters, as well as the first railway bridge of such a scale to be made of concrete.Presently, the Langwieser Viaduct is owned and used by the Rhaetian Railway; it remains the biggest bridge on the company's network. It has also been listed as a Swiss heritage site of national significance in light of its status as a pioneering reinforced concrete structure.