Kosovo is home to many monasteries and churches from the 13th and 14th centuries that represent the Serbian Orthodox legacy. Architectural heritage from the Ottoman Period includes mosques and hamams from the 15th, 16th and 17th centuries. Other historical architectural structures of interest include kullas from the 18th and 19th centuries, as well as a number of bridges, urban centers and fortresses. While some vernacular buildings are not considered important in their own right, taken together they are of considerable interest. During the 1999 conflict in Kosovo, many buildings that represent this heritage were destroyed or damaged. In the Dukagjini region, at least 500 kullas were attacked, and most of them destroyed or otherwise damaged.