Switzerland has 12 UNESCO World Heritage sites, and the Old Town of Bern was among the first to receive that recognition. You'll understand why when you stroll along the postcard-perfect Kramgasse, the main axis of the area. At the end of it you'll find the Zytglogge, the clock tower that is one of the city's most recognizable symbols. Built on a hill above a bend in the Aare River, the Old Town of Bern has a medieval street plan, though most of the current buildings were constructed in gray sandstone after a fire at the beginning of the 15th century. Miles of arcades wait to be explored—and don't miss three streets that UNESCO highlighted as among the most characteristic in the area: Postgasse, Gerechtigkeitsgasse, and Junkerngasse.