Popular Mechanics lists their top 10 pieces of infrastructure that "we must fix now:
- Circle Interchange, Chicago
- Brooklyn Bridge, New York
- Canal Lock, New Orleans
- Water System, Atlanta
- Alaskan Way Viaduct, Seattle
- Lake Okeechobee, Florida
- Dover Bridge, Bonner County, Idaho
- Wolf Creek Dam, Kentucky
- Sacramento River Levees, California
- O'Hare International Airport, Chicago
The benefits seem high but I'm not sure about the costs. I think it would be cool if some economics blog would list the top 10 pieces of infrastructure ranked in terms of net benefits.