[Trylon under construction, New York World's Fair site.]

[New York World's Fair exhibition building under construction.]

[Sixth Avenue El being dismantled.]

Under the El

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

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

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

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

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

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

[Richard Wurts documenting the construction of the New York World's Fair site, 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 New York World's Fair site.]

Under the El

[View from beneath a New York World's Fair structure.]

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

Under the 9th Avenue "El"

[Third Avenue El.]

[Third Avenue El.]