Sears Tower (now Willis Tower)

The Willis Tower, formerly known as the Sears Tower, is a prominent skyscraper in Chicago and one of the tallest buildings in the world. Completed in 1973, it stands about 1,450 feet (442 meters) tall with 110 floors. Its distinctive bundled-tube design provides strength and stability, allowing for a spacious interior and impressive panoramic views from its observation decks. The building serves as a major commercial hub, housing offices, restaurants, and tourist attractions. Its iconic silhouette and engineering achievements make it a key feature of Chicago's skyline and an enduring symbol of architectural innovation.