If one ventures beneath downtown Rochester, NY, one may find themselves here.
Here, I should say, is the abandoned subway system (wiki link).
One will spy impressive graffiti.
The abode of a homeless individual.
And if you're lucky, a colored pencil draft of said graffiti
(complete with the artist's note-to-self to call Progressive Insurance).
Needless to say, A few adventurers got their fill this spring afternoon.