The Post-Gazette has the story of a picture of Pittsburgh. A photo that is old, but no one is exactly sure how old. They are taking comments from anyone who can link something in the picture to a date or even an era. They’ve already considered that the Wabash terminal and the Horne’s sign are visible and the picture is obviously before the first renaissance, but that seems to be about all they have. I think it would be AWESOME to be an expert in Pittsburgh History capable of figuring out this puzzle, something to aspire to. Ya, I’m that kind of nerd.
There’s a link to a large version of the picture from the article.