This may not be a bridge in the true sense, but it did help something get across an area to another space. I believe it is a 'bridge' that swiveled, allowing containers from ships to be loaded and unloaded. This building down by Belgrade's river port on the Danube has been abandoned for years, but I was able to photograph this side of it during a recent river cruise.
Check out more bridges, real ones and perhaps others, on Louis La Vache's Sunday Bridges.