Beneath the Hirshhorn
Hirshhorn Museum and Sculpture Garden
Washington, D.C.
If you have to ask why, this is probably not the blog for you.
The Old Post Office, Washington D.C.
Once the city's main post office, it was saved from demolition and is now a popular tourist attraction. Where they once sorted tons of mail on the main floor, there's now an open atrium surrounded by shops and restaurants. Worth a look, if you don't mind having your bags x-rayed on the way in (because, you know, this place has got to be high on the target list of terrorists the world over).