Glenfinnan Viaduct (1975)
The Glenfinnan Viaduct is the longest concrete railway bridge in Scotland. It crosses the River Finnan on the route between Fort William and Mallaig in the Scottish Highlands. Opened in 1901, it’s 381 meters long, 30 meters high, and has 21 arched spans. The viaduct attained more recent fame when the Hogwarts Express crossed it in four of the Harry Potter films.