Sintra (Portuguese pronunciation: [ˈsĩtɾɐ]) is a town and a municipality in the Grande Lisboa subregion (Lisbon Region) of Portugal. The municipality contains two cities: Queluz and Agualva-Cacém. The population in 2011 was 377,835, in an area of 319.23 square kilometres (123.26 sq mi).Sintra is known for its many 19th-century Romantic architectural monuments, which has resulted in its classification as a UNESCO World Heritage Site.