The Siedlęcin Tower is a fourteenth-century tower castle in the village of Siedlęcin, about 7 km northwest of Jelenia Góra. It is a remarkably well-preserved medieval structure, but what makes it exceptional is the interior: two floors of Arthurian frescoes painted around 1320, depicting scenes from the legend of Lancelot and the Lady of the Lake.
The tower is now a museum and well worth the short detour from Jelenia Góra. Guided tours explain the iconography of the murals and the history of the Piast rulers who commissioned them. Check opening hours before visiting, as they are seasonal.