World Heritage Sitenoun [ C ]
uk/ˌwɜːld ˈher.ɪ.tɪdʒ ˌsaɪt//ˌwɝːld ˈher.ɪ.t̬ɪdʒ ˌsaɪt/a place, for example an area, a building, or a city, that has been put on a list by the organization UNESCO to say that it has special importance, and should be protected:
Today Vilnius' Old City is a UNESCO World Heritage Site.