Willis Tower (formerly Sears Tower)
- Built in 1973, the Willis Tower stands 108-stories over Downtown Chicago, and is the tallest building in the Western Hemisphere.
- Formerly the Sears Tower, the Willis Tower Chicago naming rights were sold to Willis Group Holdings in 2009.
- The Willis Sears Tower Skydeck Chicago is located on the 103rd floor of this famous Chicago building, and is open 365 days per year.