The Solis Viaduct (German: Soliser Viadukt) is a single track eleven-arched limestone railway viaduct. It spans the Albula River east of the hamlet of Solis, in the Canton of Graubünden, Switzerland.Designed by the engineer Hans Studer, it was built in 1902 by Munari, Cayre und Marasi for the Rhaetian Railway, which still owns and uses it today.