There are two alleys that have perplexed me for some time. Now, the District is full of small little alleys and side-streets, but two in particular (Paloma, Treto, and Waverly, connecting T & U Streets between 14th & 15th) are curious, because for simple alleyways, they were important enough to warrant street signs... not just any street sign mind you, but signs proclaiming them as "historic alleys."
A historic alley? Well... here are some things I found on the internet concerning them:
The "alley connecting 14th and 15th Sts NW has a green sign like a regular street that says Historic Waverly Alley...it had been used in a couple movies including In the Line of Fire starring Clint Eastwood. I think it's one of the most interesting alleys I've seen in D.C. It has a lot of stairs, windows, and doors."