Visby is one of Scandinavia's preeminent medieval cities. Every August, it hosts its medieval week, complete with authentic dress, feasts and jousting. But you don’t need to visit Visby in August to get a sense of its medieval history. Just follow the cobblestone streets that wind throughout the city, take a tour of its Old Town and visit the 13th-century church. You certainly can’t miss the 13th-century wall that stretches three kilometers around the city and was once used as the city’s defense from intruders.