The entire city of Valletta has been a UNESCO World Heritage Site since 1980, along with Megalithic Temples of Malta and the Hypogeum of Ħal-Saflieni. On 11 November 2015 Valletta hosted the Valletta Summit on Migration in which European and African leaders discussed the European migrant crisis. After that, on 27 November 2015 the city also hosted part of the Commonwealth Heads of Government Meeting 2015.