City Hall was built in the 1920s and served as the municipal building during British rule. It was renamed City Hall in 1951 when Singapore became a city. The Merlion statue has been Singapore's icon since the 1960s and guards the entrance to the Singapore River. The Chinatown Heritage Centre is located in restored shop houses and teaches visitors about Chinatown's cultural history through exhibits and a shop house experience. The Night Safari offers a unique opportunity to view over 100 nocturnal animal species in their natural habitats under subtle night lighting within a 40 hectare tropical forest setting.