Lunch time walk - aimless wandering

It was nice outside so I went wandering around 16th and 17th Streets today at lunch time. It amazes me that in a 30-minute stroll I can see a handful of statues, cool buildings and museums. Not to mention this food truck I did not know about, Fry Captain. Has anyone had his milkshakes? Are they any good? I've got a Potbelly very nearby so a milkshake would have to be really good for me to walk further than that...

Also I saw this sign about the green roof on the Human Right Campaign building. It was apparently the first one in downtown DC. Very cool!