Located in Chicago, Illinois, The Sears Tower was constructed in 1974, and held the title of the world’s tallest building when it overtook the World Trade Center in New York. Although it is no longer the tallest building in the world, the Sears Tower is the 5th tallest and still has the world’s highest occupied floors, highest elevator ride and the highest roof deck. The top of the tower is the highest point in Illinois. It is said that four states can be seen from the top of the Sears Tower.

This tower was designed by architect Bruce Graham and engineer Fazlur Khan in a “bundled tube” system with nine squares, sheathed in a dark tinted glass curtain wall. The building leans a few inches due to its asymmetrical design and this can be felt occasionally. The Sears Tower has a separate tourist entrance and attracts more than 1.5 million tourists each year.