Lying in the culinary heart of Vienna like an island, a little world of treats rises in the midst: the Naschmarkt food market.  A throng of buyers and curious onlookers meander through the stalls consumed by the scent of spices, distracted by the smell of sausage and stunned by the diversity of turnips, tubers, foliage and fruit on display.  In the Belly of the City: Vienna is one of a five-part series that looks at how city food markets work—how do enormous quantities of food reach there every day and where does it come from?  Directed and produced by Michael Seeber and Stefano Tealdi.