The Old Älvsborg Fortress, which was situated in a borough of today's city of Gothenburg
The Old Älvsborg Fortress (Älvsborg castle) was located at the Klippan area at the harbour entrance of Gothenburg, Sweden. It was originally a castle built by the Swedes in the 14th century. After the Danes several times easily conquered the castle, the fortification works was gradually expanded.
The New Älvsborg Fortress today, outside the city of Gothenburg.
The New Älvsborg Fortress in an image made in the late 17th century.
The New Älvsborg Fortress was built in the 17th century near the ruins of the Old Fortress, but on a small island where the Göta Älv river meets the sea, and served its purpose better. The New Fortress is today a listed building (byggnadsminne) and a popular tourist attraction.