Many science museums and science centers have interactive exhibits on bridge construction, including the Structures traveling exhibit developed by The Franklin Institute in Philadelphia (also traveled by the Association of Science Technology Centers in Washington D.C.) and the large-scale interactive bridge models at Liberty Science Center in New Jersey. One of Ken Burns' earlier films was on the Brooklyn Bridge, done I think for the Bridge's centennial. It's in much the same style as his Civil War series and has a lot of great information. And then of course there's the famous footage of Galloping Gertie, the Tacoma Narrows Bridge, as it shook itself to pieces. I don't know where to get it, but it's a classic.... Ann Mintz Orlando Science Center [log in to unmask]