What’s That? #1

Welcome to What’s That? — a weekly contest on GGW.

Each week, What’s That? will show three small close-up photographs of a well-known place three different well-known places in Washington, DC. The first person to get all three will win recognition of his or her genius when I reveal the answers a few days later.

Here’s the first set:

Post your guesses in the comments. Comments won’t appear by default to avoid spoilers, but you can click to see them (ideally after you take a guess yourself).

Update by David: Sorry, I screwed up the spoiler feature. It’s fixed now. Also, the original text made it sound as though the photos were all of the same place. They’re three different places.