Although still commonly referred to as Sears Tower, North America's tallest building was renamed Willis Tower in 2009 after Willis Group Holdings, a global insurance broker whose Midwest offices are housed there. In addition to being North America's tallest building, it is the third-tallest building in the entire world. It was constructed in 1974, designed by architect Bruce Graham. The building's Skydeck is a great place to admire a stunning view.

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