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People watch as construction begins at the site of the future Sears Tower in 1971.

U.S. Taking a break during construction of the Hancock Building, Chicago, 1965.

The Adler Planetarium under construction in 1929.

A construction worker stands atop the attenna of the Sears Tower, nearing completion, 1972, Chicago. He is untethered, about 1485 feet in the air…

Sears Tower Construction.

View from Wacker Drive of the Sears Tower under construction in 1972.

Night view of the Palmolive Building with the Water Tower in the foreground. The lights are from automobiles creating movement streaks on Michigan Ave., c. 1931. Photograph by Ken Hedrich.

*Randolph Street, Chicago, 1900

Mackinac Bridge Construction, 1955

Old steam train leaving Chicago - Sears Tower in the background

The Sears Tower under construction in Chicago, circa 1970-73 it will always be the Sears Tower. I can't even think of that supposed new name. Really. I can't remember the name. Lol

Sears Tower under construction, 1972 or 1973

vintage CHICAGO photo Michigan Boulevard Bridge 1950s Chicago vintage photograph

Sears Tower, Hancock Lightning Strike in Chicago | Wonderful Places

Rockefeller Center is pictured under construction in 1932. The New York City icon was completed in 1939.

Eiffel Tower under construction, 1888

Manhattan Bridge under construction, 1908

Chicago, Illinois. Sears Tower.

U.S.Steel Tower - A welder works on the top corner of the tower on June 14, 1970.

Brooklyn Bridge construction, 1877

Mackinaw Straits Ferry - Mackinaw, Michigan - 1950 When the Mackinac Bridge opened to traffic on November 1, 1957, car ferry service between Mackinaw City and St. Ignace ended. In 34 years of service, the ferries operated by the Department of State Highways carried approximately 12 million vehicles and more than 30 million passengers across the Straits of Mackinac.