Street-food markets are all the rage the world over, and in Vienna you have the chance to visit one that’s been around for many centuries. Built literally over the channeled Vienna River, just beyond the Ringstrasse, the Naschmarkt is devoted to what its name happens to sound like in English: noshing. Whether you order a spicy wurst, browse the fish and cheese stalls, or purchase local products like pumpkin-seed oil and apple vinegar, the Naschmarkt is one of the city’s most enjoyable simple pleasures. In recent years, some gastronomic and ethnic food stalls have expanded into full restaurants. For decades, 400 dealers have set up their Saturday flea market next door, where shoppers hunt for bargains among books, record albums and CDs, and antiques.