The NYC Subway system occasionally has vendors underground - variants of newspaper stands and bodegas. Maybe a Gyro stand, perhaps? But it turns out there's over 100 of those shops just sitting empty. Maybe people don't want to buy a Gyro from a subway bodega??

So the Metro Transit Authority has been bestowing some of the empty spaces to artists to create their own installations. It's called the Vacant Unit Activation Program. One great example is Rex's Dino Store - a seven foot tall paper mache dinosaur selling a number of customized (and pun-heavy) items. A delight if you ask me!

There are plenty more examples - past and present - but you're going to be hard pressed to beat that dino.