- A Guide to Old Covered Bridges of Southeastern Pennsylvania and nearby areas Thomas Mill Bridge The Only Standing Historic Covered Bridge within Philadelphia City Limits Covered bridges symbolize small-town America. Something from the nineteenth century, a little archaic and strange to nineteen-nineties eyes, picturesque and sentimental, kissing bridges recall a time when life was simpler and ...william-king.www.drexel.edu/top/bridge/CB1.html