Recreating Roman Concrete That Lasts 2,000 Years

The fact that the Romans had a better formula for concrete than we have today is amazing:

U.S. Dept. of the Interior, Bureau of Reclamation tried to recreate Roman cement. See Taking Cues From the Ancient Romans.

Show me a building in the United States that will last as long as the Pantheon. See 10 FACTS ABOUT THE PANTHEON.