Ports, harbors and dams all serve great purposes. Dams prevent flooding. They provide a wall against onrushing water to protect people below. Ports and harbors

Rivers have tumbled down mountains and floated lazily through flat plains in the US since long before Europeans first came to this continent. They were the only

They hover over rivers and lakes and valleys and railroad tracks and even parts of oceans. They can be beautiful and they can be ugly. But most of all, they nee

Imagine a world without airports! Air travel has changed the way we live and work, but no one would be able to travel without airports. Over the past 100 years,

Infrastructure is something that we use every day, like roads, bridges, and tunnels, but probably never think too much about. However, in the United States, man