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

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

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

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

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

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

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

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

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

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

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

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

[New York World's Fair. Richard Wurts with steel frame of Perisphere and Trylon in background.]

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

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

[New York World's Fair. Pile driver with Perisphere and Trylon in background. Construction view.]

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

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