Chojnik Castle sits on a basalt outcrop 627 metres above sea level in Karkonosze National Park, about 12 km south of Jelenia Góra. The ruins are substantial and dramatically positioned, with views over the Jelenia Góra Valley and across to the Karkonosze ridge. The castle was built in the fourteenth century, expanded in the sixteenth, and struck by lightning in 1675, after which it was never fully restored.
The walk up from Sobieszów (the village at the foot of the hill) takes about 45 minutes through forest and is well-marked. You can return by a different trail for variety. There is an entry fee for the ruins and tower. The climb up the tower, though steep, gives some of the best views in the region.