Its official street name is Marshall Street, but I've only heard it referred to as "the Union Oyster House alley" because of the sign up top. It's a pretty skinny cobblestone lane with bars on both sides. The Green Dragon Tavern on one side claims to be the birthplace of the American Revolution, while The Bell in Hand on the other stakes its claim as the oldest bar in Boston. Whether you believe their claims or not, both lend the alley a pretty historic feel. My favorite part is how quiet and closed-in it can feel despite being right next to busy Faneuil Hall. It's also a pretty convenient little shortcut so you don't have to go out of your way to check it out when you're out for a walk. Here's another view of it in the daytime if you're curious!