New York City has over of parkland and 14 linear miles (22 km) of public beaches. Manhattan's Central Park, designed by Frederick Law Olmsted and Calvert Vaux, is the most visited city park in the United States. Prospect Park in Brooklyn, also designed by Olmsted and Vaux, has a meadow. Flushing Meadows–Corona Park in Queens, the city's fourth-largest, was the setting for the 1939 World's Fair and 1964 World's Fair.