The Unisphere is a 12-story high, spherical stainless steel representation of the Earth. Located in Flushing Meadows – Corona Park in the borough of Queens, New York City, the Unisphere is one of the borough's most iconic and enduring symbols.

Designed by landscape architect Gilmore D. Clarke, the Unisphere was donated by the United States Steel Corporation and constructed by the American Bridge Company. It is the world's largest global structure, rising 140 feet and weighing 700,000 pounds. Some sources say the Unisphere weighs 900,000 pounds, a figure which includes the additional weight of its 100-ton inverted tripod base. The diameter of the sphere itself is 120 feet, or 36.57 meters. It is constructed of Type 304L stainless steel.

Built on the structural foundation that supported the Perisphere of the 1939–1940 New York World's Fair, the Unisphere is centered in a large, circular reflecting pool and is surrounded by a series of water-jet fountains designed to obscure its tripod pedestal. The effect is meant to make Unisphere appear as if it is floating in space.

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