Some people have always been frightened of bridges. Gephyrophobia sufferers often try to avoid crossing bridges altogether, driving miles out of their way to avoid them. Of course, quite a few bridges can be rough experiences for those with acrophobia, as well. With some bridges, however, terror seems to be the only sensible response. Here, we look at 12 bridges that would turn anyone’s legs to jelly. Read on, but don’t look down.