The well preserved, 17th century Elfsborg Fortress is located on a small island at the entrance of the harbour, at the mouth of the Göta River near Gothenburg. With a fascinating history of battles against the Danes, the fortress was once the mightiest citadel in Sweden for coastal defence and is highly popular with visitors. Boat tours of the archipelago offer passage to the fort, along with sights of the pretty waterways of the river. A dramatised tour is included in the admission fee.

Address: Byggnad 29

Website: www.stromma.se

Telephone: (0)31 158 151

Transport: Boat tours depart daily to the fortress island from Lilla Bommen jetty between May and August, and weekends only in September

Admission: Boat tours: SEK 160 (adults), SEK 80 (children 6-11)