Jefferson Memorial

The Thomas Jefferson Memorial is a presidential memorial in Washington, D.C. that is dedicated to Thomas Jefferson, an American Founding Father and the third president of the United States.

After the Great War, the Memorial was turned into something that resembles a water filtering facility with low-tech construction all around it and many pipes going in and out. It is not known if the original statue of Jefferson stands or not.

Washington Monument has been claimed by the super mutants who are constantly patrolling its perimeter.

Thomas Jefferson Memorial houses Project Purity. You must clear it of Mutants in order for James and his team of scientists to move in.

Speculation
The Waters of Life quest might be connected to it because of both the name and the Vault Boy icon of the quest fit with the Memorial's water pipes.