The first site in Montenegro to be added to the list was Natural and Culturo-Historical Region of Kotor, inscribed at the 3rd UNESCO session in 1979.[3] The Durmitor National Park was inscribed in 1980 and extended in 2005.[4] These two sites were first added to the list when Montenegro was still a part of Yugoslavia. In addition, there are two transnational sites on the list. The Stećci Medieval Tombstone Graveyards site, inscribed in 2016, is shared with Bosnia and Herzegovina, Croatia, and Serbia,[5] while the site Venetian Works of Defence between the 16th and 17th centuries is shared with Croatia and Italy.[6] The Durmitor National Park is listed as a natural site while the other three are cultural sites, as determined by the organization's selection criteria.[5]