Listed as a UNESCO World Heritage Site since 7th July 2008, the Landwasser Viaduct is a railway viaduct still considered today as an architectural feat. Designed by Alexander Acatos, the monument was built between 1901 and 1903 by Müller & Zeerleder. Crossing Schmitten and Filisur, it was renovated in 2009 exactly 106 years after its construction.