Slide show: Willis Tower

Willis Tower

An iron worker, oblivious to his precarious perch, constructs the top floors of the 110-story Sears Tower in 1973. In the background is the John Hancock Center.

PHOTO CREDIT: CORBIS

Willis Tower

Chicago Mayor Richard J. Daley, left, and Sears Chairman Arthur Wood, applaud as the topping out beam is put into position on top of the 110-story Sears Tower at topping out ceremonies.

PHOTO CREDIT: CORBIS

Willis Tower

Workers stream out of the Sears Tower in Chicago, which was evacuated as a precautionary measure following the Sept. 11 terrorist attack in New York.

PHOTO CREDIT: Sue Ogrocki/Reuters

Willis Tower

Workers mill around outside the Sears Tower in Chicago, which was evacuated following the Sept. 11 terrorist attack in New York.

PHOTO CREDIT: Sue Ogrocki/Reuters

Willis Tower

John Hlava monitors action in the Sears Tower from the security control room in July 2006.

PHOTO CREDIT: Erik Unger

Willis Tower

Aerobatics Team Oracle demonstrates its skills over the Chicago lakefront on August 2008.

PHOTO CREDIT: Erik Unger

Willis Tower

Known as the Sears Tower since it opened in 1973, the tallest building in the United States changed its name to Willis Tower and is named for the London-based insurance brokerage Willis Group Holdings.

PHOTO CREDIT: Charles Rex Arbogast/AP

Willis Tower

A worker does some last-minute cleanup to the windows of the Ledge just prior to the attraction’s public opening on July 2, 2009.

PHOTO CREDIT: Stephen J. Serio

Willis Tower

Visitors to the Ledge on opening day in 2009.

PHOTO CREDIT: Stephen J. Serio

Willis Tower

Dusk over the skyline of Chicago in June 2006.

PHOTO CREDIT: Erik Unger

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8 = Slide show: Willis Tower - Photo Galleries - Crain's Chicago Business