The Venetian Castle was built during the 15th century in Split. Built just south-west of the Diocletian's Palace along the shoreline, the castle had an irregular pentagonal shape with three towers facing north and overlooking the city. The decision to build the castle was made in 1424, however, it wasn't until 1441 that it was actually built on the grounds of a demolished monastery. By the early 16th century, the castle was in poor condition and it wasn't until the first half of the 17th century that work on improving it began.
By the early 19th century, the castle had lost its defensive purpose and the southern walls were demolished between 1806 and 1807 on the orders of Auguste de Marmont during the Napoleonic Wars. Presently, what remains of the castle is the large central tower and the smaller eastern tower with the wall connecting them, both located on the Radić Brothers Square (Trg braće Radić).References:
Varberg Fortress was built in 1287-1300 by count Jacob Nielsen as protection against his Danish king, who had declared him an outlaw after the murder of King Eric V of Denmark. Jacob had close connections with king Eric II of Norway and as a result got substantial Norwegian assistance with the construction. The fortress, as well as half the county, became Norwegian in 1305.
King Eric's grand daughter, Ingeborg Håkansdotter, inherited the area from her father, King Haakon V of Norway. She and her husband, Eric, Duke of Södermanland, established a semi-independent state out of their Norwegian, Swedish and Danish counties until the death of Erik. They spent considerable time at the fortress. Their son, King Magnus IV of Sweden (Magnus VII of Norway), spent much time at the fortress as well.
The fortress was augmented during the late 16th and early 17th century on order by King Christian IV of Denmark. However, after the Treaty of Brömsebro in 1645 the fortress became Swedish. It was used as a military installation until 1830 and as a prison from the end of the 17th Century until 1931.
It is currently used as a museum and bed and breakfast as well as private accommodation. The moat of the fortress is said to be inhabited by a small lake monster. In August 2006, a couple of witnesses claimed to have seen the monster emerge from the dark water and devour a duck. The creature is described as brown, hairless and with a 40 cm long tail.