The Landwasser Viaduct is a railroad bridge, between Filisur, Switzerland, and Chur, Switzerland. From Filisur, the train crosses the bridge and goes into the 700-foot long Landwasser Tunnel. The viaduct was built in 1902 and is now a UNESCO World Historic Site. My husband and I rode the train from Chur to the Filisur railroad station. Following signs, we walked a long path until we reached a viewing platform that provided a vantage point to watch trains cross the viaduct into the tunnel and take pictures. My husband says that it offers one of the most spectacular railroad photo opportunities in Europe. Just a note: We're walkers, not hikers. The most physical challenge came from the roots and rocks on the path.
If you're a train fan like my husband, this detour would be worthwhile if you're in the area. There's a strong possibility that you have seen pictures of the Landwasser Viaduct in Swiss travel brochures. Moreover, if you have ridden the Glacier Express from St Moritz to the Matterhorn, you rode over the viaduct.