[Construction at the New York World's Fair site, showing Trylon and Perisphere.]

[Construction at the New York World's Fair site, showing Trylon and Perisphere.]

[Site of the New York World's Fair, showing the Trylon and Perisphere under construction.]

[Construction at the New York World's Fair site, showing Perisphere, Helicline and Trylon.]

[Grounds of the New York World's Fair, showing Trylon and Perisphere.]

[Trylon and Perisphere, New York World's Fair.]

[Trylon and Perisphere, New York World's Fair.]

[Trylon and Perisphere at the New York World's Fair.]

[Grounds of the New York World's Fair, showing the Trylon and Perisphere.]

[Grounds of the New York World's Fair showing the Trylon and Perisphere.]

New York Worlds Fair. Perisphere and Trylon steel frame

[Construction of the New York World's Fair site, with the frames of the Trylon and Perisphere in the background.]

[Construction of the New York World's Fair site, with the steel frames of the Trylon and Perisphere visible.]

[Grounds of the New York World's Fair, showing the Trylon and Perisphere.]

[Perisphere and Trylon at the New York World's Fair.]

[Construction of the Trylon and Perisphere, New York World's Fair site.]

[Construction of the New York World's Fair site, with the frames of the Trylon and Perisphere in the background.]

[Construction of the New York World's Fair site, with the frames of the Trylon and Perisphere in the background.]

[Construction of the New York World's Fair site, with the steel frames of the Trylon and Perisphere visible.]

[Construction of the New York World's Fair site, with the frames of the Trylon and Perisphere in the background.]