Pittsburgh's Bridges - Images of America Author:Todd Wilson PE, Helen Wilson Pittsburgh is the City of Bridges, and what remarkable bridges they are! The areas challenging topography of deep ravines and mighty riversthe Monongahela, Allegheny, and Ohioset the stage for engineers, architects, and contractors to conquer the terrain with a variety of distinctive spans. Many were designed to be beautiful as well as functiona... more »l. While other cities may have one signature bridge, Pittsburgh has such a wide variety that no single bridge can represent it. Pittsburghs Bridges takes a comprehensive look at the design, construction, and, sometimes, demolition of the bridges that shaped Pittsburgh, ranging from the covered bridges of yesterday to those that define the skyline today.« less