Gotland, initially an independent sovereign entity, fell under German rule in 1398, Danish rule in 1408, Swedish rule in 1645, Danish rule again in 1676, and ended up as part of Sweden in 1679, with a brief 23-day occupation by the Russians in 1808.
Interestingly, when Gotland fell under Swedish rule, it did so as the result of peace treaties, whereas other countries' means of obtaining it were generally not peaceful.Many Swedes vacation on Gotland, it is often thought of as exotic since the nature and light here differ form that of the rest of Sweden.
The Visby wall in the background. The hanseatic city of Visby is since 1995 on UNESCO's World Heritage Protection list. The Visby City Wall was built in two stages and was completed 1288. It is almost 3,500 km long.