This sign, in Boston's South Station, still posted on the back glass wall of the newsstand, is all that remains from my first attempt to add virtual content to the real world, which was a game-like experience (mixed with news). Amazing that it's still there, more than ten years later.
Here's a bigger picture:
A sign for The Pulse of Boston, in South Station.
Nieman Reports ran an article that mentioned this project prominently: Can mesh networks and offline wireless move from protest tools to news?