There's really no such thing as a bridge to nowhere as every bridge has to go somewhere. The only exception might be an abandoned bridge which no longer goes anywhere. A prime example might be the old Deep Fork River bridge on US 266 east of Dewar, Oklahoma. Built in 1933, this bridge was replaced in 2005 by a bridge on a new alignment and the approaches removed. So, technically, you could call this a bridge to nowhere.
You can see photos of this bridge and other bridges on my Flickr pages.