2 of 12
The iconic Sears Tower was completed in 1973 and remains the tallest building in the United States. Originally commissioned by Sears, Roebuck and Co., the tower was built to house the company's headquarters. Sears had vacated the building by 1995, and the tower is currently occupied by more than 100 different companies. About 1.5 million people visit the tower's Skydeck annually.
Fun Fact: Including the height of its antennae, the Sears Tower ranks as the tallest building in the world; it will lose its title to the Burj Dubai upon completion. Without the inclusion of its antennae, the Sears Tower ranks second to the CN Tower as the tallest building in North America.
Photo source: Carol M. Highsmith
Next: Shedd Aquarium