Skansen Kronan is a redoubt built in the later half of the 17th century according to the plans of Erik Dahlberg. Skansen Kronan was introduced in 1698 and was fitted with 23 guns. The roof was not completed until 1700. Skansen has 4-5 metre thick walls made of granite, gneiss and diabase. Skansen Kronan was never attacked and the cannons on the inside have never been used.
The fortress and the twin counterpart, Skansen Lejonet, were built as part of the defenses against possible Danish attack on Gothenburg from the south, and thus had a similar purpose as the Älvsborg Fortress.
The fortress - originally built outside the city walls - is today situated in the city centre of Gothenburg on a hill in the city district of Haga. It was used as a military museum until 2004. Today Skansen Kronan is a private facility for conferences and private parties.
References:Duino Castle was built by the Wallsee family in 1389 on the cliffs overlooking the Gulf of Trieste. It replaced an older castle from the 11th century. Over time, the Wallsee family disappeared and the castle, after having been used as a prison, became the residence of the Luogar and Hofer.
At the end of the 19th century it became the property of Prince Alexander von Thurn und Taxis from the Czech branch of the House of Thurn and Taxis. It remains with the family to this day with his great-grandson Prince Carlo Alessandro della Torre e Tasso, Duke of Castel Duino the current owner. The castle has been opened to the public as a museum and park.