North of Sevan, further into the mountains, is Dilijhan, a resort much favored during the Soviet period for the medicinal powers attributed to its mineral water. The authorities aspire in the long term to develop ski and spa resorts in this region, but at present, tourist infrastructure remains at a primitive level. A few kilometers east of Dilijhan, in a wooded gorge, is the Agartsin Monastery, believed to have been the major cultural center in medieval Armenia, and one of the very few perfectly preserved examples of the architecture of its period (10th to 13th centuries). The refectory building is particularly prized. 25km (16 miles) from Dilijhan, the 12th-century Goshavank Monastery features some of the finest examples of the delicate, lacey style of stone carving developed by medieval craftspeople in the region.