The Maryland Zoo — also known as The Maryland Zoo in Baltimore and formerly known as The Baltimore City Zoo or the Baltimore Zoo — is a 135-acre park located in historic Druid Hill Park in the northwestern area of the City of Baltimore, Maryland, with the postal address of 1876 Mansion House Drive. Druid Hill was opened in 1876 as the first major park purchase by the City under foreseeing Mayor Thomas Swann, and was later designed by famed nationally-known landscaper Frederick Law Olmsted, with additional work on various park buildings contributed by future Baltimore City Hall architect George A. Frederick, and Park Commissioner John H.B. Latrobe, who also was an accomplished lawyer, author, artist, amateur architect and civic leader. Olmsted had earlier won a contest for the design of plans for New York City's famed Central Park in mid-town Manhattan in 1858, a year after it opened, and worked on the massive public works project during its construction from 1858 to 1873. The Maryland Zoo is now currently home to over 2,000 animals, and is accredited by the Association of Zoos and Aquariums.