Places in DC 6

Dear internet,

For my own nostalgia I will post photos of places in DC. Answer of “where was I?” when you hover over the photo.

Where are these people? hint: It’s a metro station, the deepest in DC.

dupont circle metro escalator going up
Too bad the Walt Whitman quotation didn’t make it into the photo

The previous Places in DC 5, the answer was the Sackler Gallery. I tried to find the name of the atrium, but it’s just called the Grand Staircase which wraps around a diamond-shaped fountain on the bottom floor.