The Brusio spiral viaduct is a single-track nine-arched stone spiral railway viaduct on the Bernina Railway. It was opened on 1 July 1908.
A key structure of the World Heritage Site-listed Bernina Railway, it is located near Brusio, in the Canton of Graubünden, Switzerland, and was built to limit the railway's gradient at that location within its specified maximum of 7%. It is considered to be one of the architectural highlights of the Rhaetian Railway.
Wikipedia https://en.wikipedia.org/wiki/Brusio_spiral_viaduct
Official Website https://www.rhb.ch/en/home
Address 7743, Switzerland
Coordinates 46°15'13.569" N 10°7'40.43" E
