What’s That? #2

What’s That? is back for week #2. Each week, I’ll show small close-up photographs of 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 set for this week:

The comment settings are worked out, so 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).