The largest in the world when it opened in 1896, the New York Aquarium, in the refurbished Castle Clinton, quickly became one of the city’s most popular tourist attractions. Housed in this facility were thousands of fish, some of which were brought back by local sea captains, hundreds of invertebrates, reptiles and amphibians and several types of sea mammals. The aquarium also maintained a fish hatchery used to stock upstate rivers and supply schools with research specimens. It closed in 1941 under pressure to build the Brooklyn-Battery Tunnel and, after a brief stint at the Bronx Zoo, it moved to Coney Island in 1957.