The best museum in North Korea outside Pyongyang, housed in the former Sungkyunkwan Confucian academy — a handsome complex of courtyards and wooden halls. The collection spans Koryo-dynasty celadon pottery, bronze bells, coins, and stone Buddhist sculpture. The celadon in particular is exceptional: the muted blue-green glaze and inlaid floral patterns of 10th–14th century Korean ceramics reached a peak of refinement that was never quite matched again. Labels are in Korean and sometimes Chinese, but the objects speak for themselves.
The academy grounds are pleasant to walk through even if you tire of the artefacts.