Naples is involved in town twinning (known as gemellaggio in Italian), a mutual partnership with several cities. Below are partner cities listed on the official website of the city of Naples; Partner cities: Since 1995, the historic centre of Naples has been listed as a World Heritage Site by UNESCO, a programme which aims to catalogue, name, and conserve sites of outstanding cultural or natural importance to the common heritage of humanity. The deciding committee who evaluate potential candidates described Naples' centre as being "of exceptional value", and went on to say that Naples' "setting on the Bay of Naples gives it an outstanding universal value which has had a profound influence".