It can be found in @graubuenden below Brusio train station: the 143-metre-long spiral viaduct. This landmark of the @rhaetischebahn leading through Val Poschiavo is part of the UNESCO World Heritage site, and its rounded shape makes it truly fascinating in all seasons! #grandtraintourofswitzerland #rhaetiansensation⁣ ⁣ 🎥 @fabiangattlen