The idea of super-dense cities building new structures on top of old buildings has been kicking around sci-fi novels and architecture circles for decades, but the idea still isn't ubiquitous. In Austria, the owner of a 1950s-era building is giving it a shot.
Well, this ought to make a lot of morning commutes a little more interesting! Austrian architects have converted streets in the city of Graz into a makeshift track, lanes and all. Late for work? Now you'll have some serious motivation.