What’s That? #3

Welcome back to What’s That?.

Let’s call the first two weeks “practice.” This week I’m kicking it up and have picked some places that should be a little harder.

For those who missed weeks 1 and 2: Each week, I show small close-up photographs of three different well-known places in and around Washington, DC. The first person to get all three wins recognition of his or her genius when I reveal the answers a few days later.

Here’s the set for this week:

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).