United Nations Building, 1956.

Not technically in New York City, but in international territory owned by the United Nations, the headquarters of the UN consists of four main buildings. The two buildings seen in this photograph taken a few years after the structures were completed, are the Secretariat Building (the tall one) and the General Assembly Building (the low rise sloping building).

The Secretariat Building is 39 stories above ground and three stories below and was completed in 1952. It was designed by Brazilian architect Oscar Niemeyer and the Swiss-French architect Le Corbusier, as part of a larger board of architects.The long exterior facings of the building are made of aluminum, glass, and marble. This International Style building was the first skyscraper in the city to feature a glass curtain wall (an extremely common design method in the 21st century).

The low rise building is the General Assembly Building, and it is 380 feet long and 160 feet wide with concave sides and a shallow dome on top. The minimal ornamentation, curving facade, and wide open interiors exemplify the International Style. The building, which was created by a Board of Design Consultants from all over the world, headed by the American Wallace K. Harrison, houses the large hall where the delegates to the UN meet.