Visby - The Rise and Fall of the Hanseatic City, Sweden (148/418)

A former Viking site on the island of Gotland, Visby was the main centre of the Hanseatic League of the Baltic from the 12th to the 14th century. Its 13th-century ramparts and more than 200 warehouses and trading establishments from the same period make it the best preserved fortified commercial city in Northern Europe.