The Silver Cap Tower
Visit to the tourist attraction of Sweden - the part of Visby city wall - The Silver Cap Tower: is the most recent tower of the city wall of Visby, built by the Teutonic Order who ruled Gotland between 1398–1408.
Wikipedia: The tower forms part of the most recently erected group of defensive towers and is placed at an angle between the part of the wall facing the sea and the part facing land. At the top of the tower, on the third floor outside, there was originally a wooden gallery for archers. On the same floor there was also a place where a fire could be lit, mainly used for signalling purposes. In the beginning of the 18th century during the Great Northern War, the arrow-slits were enlarged. The Silver Cap Tower was a northern outpost and the strategically located tower served as key fortification for securing the beach along the part of the wall facing the sea.