Museum Vestsjæland is a fusion of eleven local museums covering the municipalities of Holbæk, Kalundborg, Odsherred, Ringsted, Slagelse and Sorø. The museum is also responsible for the archaeological excavation and conservation of these regions.
The museum is a centreof cultural knowledge for the local inhabitants. It collects, exhibits and disseminates local history as well as the greater events in Danish history.
Vestsjælland (West Zealand) was a major centre of power in Europe in the Viking and medieval period and the museum collections reflect these eras, along with other periods of history.