cultural history museums in Norway. There are more than 60 buildings on the site now, covering a broad ethnological range. See also Civil war era in Norway References Other sources Gjerset, Knut (1915) History of the Norwegian People (The MacMillan Company) Kavli, Guthorm (1987) Norges festninger (Universitetsforlaget) Koht, Halvdan (1995) Sverresoga (Oslo: Det Norske Samlaget) Krag, Claus (2005) Sverre – Norges største middelalderkonge (Oslo: H. Aschehoug & Co) External links Official website Sverresborg Trøndelag Folk Museum Castles in Norway Military installations in Trondheim Forts in Norway Museums in Trondheim Open-air museums in Norway Photography archives in Norway Culture in Trondheim