The Sphere was relocated to Battery Park, after it was repaired from the 9/11 damage Franz Koenig's. The world's largest bronze sculpture of modern times stood between the twin towers on the Austin J. Tobin Plaza of the World Trade Center in New York City from 1971 until the terrorist attacks on September 11, 2001. The work, weighing more than 20 tons, was the only remaining work of art to be recovered largely intact from the ruins of the collapsed twin towers after the attacks. After being dismantled and stored near a hangar at John F. Kennedy International Airport, the sculpture was the subject of the 2001 documentary Koenig's Sphere. Since then, the bronze sphere, primarily known in the United States as The Sphere, has been transformed into a symbolic memorial to commemorate 9/11.