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

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

[Construction of Electrical Products building with frame of Trylon in background, 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.]

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

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

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

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

[Richard Wurts next to the frame of the Trylon during construction of the New York World's Fair site.]

[New York World's Fair site under construction, with the steel frame of the Trylon 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 Perisphere and Trylon, New York World's Fair site.]

[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.]

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

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

[New York World's Fair. Motor police officer in front of New York City Building. Construction view. (With the Trylon and Perisphere in the background.).]