Here are three of my favorite bridges. The first bridge is the longest, unsupported span I have ever seen made with Rokenbok. The second bridge has wonderful realisim. I love the arched opening of the third bridge. All three are real engineering treats!
All three of these bridges were 2009 contest submissions in a ROK'n Roadways Building Challenge. You can see all of the entries here: ROK'n Roadways Challenge