Department of Justice in Washington, D.C.
"Qui Pro Domina Justitia Sequitur."
I just had to take this photo as I was passing by the Department of Justice. I really wanted a good photo of the flag on the opposite side of the building, but the wind was not cooperating, as you can see from the second photo. Next time.
For those of you who don't know exactly what the Department of Justice does, look to the name: they are responsible for the enforcement of the law and administration of justice.
Latin fans may be interested in info on their motto.