14th century. It is made from locally quarried limestone, rubble limestone filling, fat lime mortar and clay mortar. The first wall was lower than at present and constructed as two thin walls of solid limestone with rubble used to fill the gap between them. When the height of the wall was increased during the second building phase, solid limestone stabilized with lime mortar was added on top of the first wall. Due to this, most of the weight of the wall is carried by the two thinner outer stone layers of the first wall. The joints of lime mortar in these layers were reinforced with stronger cement during 20th century restorations. Originally, the wall had 29 large regular towers and 22 small towers riding on top of the wall, 27 of the large and 9 of the small towers remain. It was approximately , of which is still standing. The wall encloses the old town of Visby which is built on a steep slope facing the Baltic Sea. The west part of the wall nearest the sea, is built on land approximately above sea level. To the north and south the wall climbs the slope known as the Klinten, towards the east where the highest elevation reaches about . Towers, buildings, gates and parts of the wall Other features References Bibliography External links Visby vallgravar. Kulturhistorisk dokumentation 2010 [Visby trenches. Historical cultural documentation, 2010] (in Swedish). Northern Fortresses: Visby 13th-century establishments in Sweden Visby Visby Tourist attractions in Gotland County Buildings and structures in Gotland County