The street is home to some of New York's most well-known structures, including the United Nations headquarters, the Chrysler Building, Grand Central Terminal, the New York Public Library Main Branch, Times Square, and the Port Authority Bus Terminal (from east to west). In addition, it is a popular place with tourists, especially those visiting Times Square. The area's many billboards and signage make it a popular destination for photographers. One of the world's busiest intersections, 42nd Street connects Manhattan with its neighboring boroughs: Brooklyn to the south and Queens to the north. It is also connected by Amtrak and New Jersey Transit trains at Penn Station, as well as buses from throughout the region. The term "42nd Street" may be applied to any one of several streets in various cities around the world that have entertainment districts similar to that of New York City. These include: Sydney's Oxford Street, London's Covent Garden, Melbourne's Collins Street, Buenos Aires' Santa Fe Avenue, Rio de Janeiro's Rua Augusta, and San Paulo's Paulista Avenue. New York City's 42nd Street has been called the "center of the world" because of its prominence as an international hub of commerce.