My wife and I spent the afternoon at the Library of Congress in Washington, DC...
here's the view across the street from the main entrance:

The interior is spectacular with amazing ceiling and wall decorations everywhere:

Here's the stairway leading to the gallery that overlooks the main reading room:

There's a lot more than books in the Library of Congress... among the items on display are a Gutenberg bible:

The Presidential Medal of Freedom awarded to comedian Bob Hope:

And a collection of Mayan flasks from the years 600-800 AD:

Great spot to visit next time you're in Washington, DC!