A favorite Sunday outing for Zagrebians, Medvednica has been set aside as a nature park. From spring through autumn locals come here to walk and cycle (there is a network of well-marked paths), and in winter they come to ski. There are several cozy mountain huts, serving hearty fare for hikers, as well as ski rental shops. There’s also a medieval fortress, Medvedgrad, which is open to the public. Medvedgrad ([tel] 01/457-20-71) was built on the slopes of Mt. Medvednica in the 13th century as a strategic lookout point to protect Zagreb after the Mongol invasion of 1242. However, it was badly damaged in an earthquake in 1590, and consequently abandoned. Outside standard opening hours (May through October from Tuesday through Sunday 11am to 7pm and November through April Tuesday through Sunday from 11am to 4pm; admission 15kn), it hosts occasional classical music concerts. The highest peak in the park is Sljeme (1033m/3390 ft.), which is a 20-minute drive from Zagreb. If you are using public transport, take tram no. 14 from the main square to the end of the line (Mihaljevac), and then a bus to Tomislav Dom Hotel on Sljeme. Note that the cable car is no longer functioning.