Four major attractions are under the direction of Malmö Museer (tel. 040/341-000). Heading the list is Malmöhus Castle, on Malmöhusvägen, founded in the 15th century by Eric of Pomerania and rebuilt by Christian III in the 16th century. Once a prison (the earl of Bothwell, third husband of Mary Queen of Scots, was incarcerated here in 1568-73), the castle now houses the City Museum, the Natural History Museum, the Aquarium and Tropicarium, and the Konstmuseet. The last contains a collection of old Scandinavian masters, especially those from southern Sweden, such as Carl Fredrik Hill (1849-1911), one of Sweden's best landscape painters and a forerunner of European modernism. Most interesting is the collection of Russian oil paintings from around 1900 -- the largest collection outside Russia. It also houses some modern art and good samples of Swedish furniture and textiles. The lyrical sketches in the foyer are by Carl Larsson, one of Sweden's best-known artists. West of Stortorget, the castle can be easily reached on foot.