Älvsborgs fästning

Situated in the mouth of Göta river, slightly west of Göteborg, this was a very important stonghold. Built in the end of the 16th century, captured by the Danes in the beginning of the 17th century - Sweden had to pay a huge ransom to get it back.... The province of Halland used to belong to Denmark, and the province of Bohuslän was Norwegian, so the town of Göteborg, which was busy getting built during this time, was surrounded by enemies....