Gotland Capital Visby Visby is the capital of Gotland, the largest island in Sweden, and a medieval Hanseatic town surrounded by a 3.4 km wall, almost complete. A UNESCO World Heritage Site, it has ruins of Gothic churches, the cathedral of Santa Maria, stone houses and alleys covered in roses in summer. The Gotlands Museum houses the painted stones and Viking silver. Lummelunda cave and the raukar of Fårö lie to the north.