Lethbridge Alberta - There's a reason they call this prairie town Bridge City.
 
The Lethbridge High Level Bridge is the longest and highest of its type (technically a steel viaduct) in the world.
 
Completed in 1909 by Canadian Pacific Railway, it replaced 20 wooden bridges between Lethbridge and Fort Macleod and it's 1.6 kilometres long and 100 metres high as its highest point.
 
Some of the best places to photograph it are from low and high points within Indian Battle Park (and spots along Third Avenue South and First Avenue South where you can park your car).
 
Freight trains still travel over it so you can go under it, but not on it.
 
Jennifer Bain.

Article abridged - non-railway data removed.