Willis Tower
Willis Tower, formerly known as Sears Tower, is a skyscraper in Chicago, Illinois, that held the title of world's tallest building for nearly 25 years.
Holding the title of world's tallest building for nearly a quarter century after its completion, this Chicago skyscraper remains one of the most recognized structures in American architectural history.
Formerly the World's Tallest Building
Willis Tower, originally known as Sears Tower, held the title of world's tallest building for nearly 25 years following its 1973 completion.
A Distinctive Bundled Tube Design
The tower's distinctive structural design uses a bundled tube system, an innovative engineering approach that influenced subsequent skyscraper construction.
The Skydeck Glass Ledges
The tower's observation deck features glass floor ledges extending outward from the building, offering visitors a dramatic view directly down toward the street below.
An Enduring Chicago Landmark
Despite losing its height record and later renaming, the tower remains one of Chicago's most recognized and significant architectural landmarks.
