44K views · 839 reactions | Wind blowing off Lake Michigan is a common challenge to architects and engineers building in Chicago. Here's how Fazlur Kahn, structural engineer of Willis (Sears) Tower, developed a system capable of distributing the load of the building's 110 stories in the face of even the strongest gusts. | Chicago Architecture Center | Facebook

The Willis Tower, formerly Sears Tower, is a 110-story skyscraper in Chicago, completed in 1973. Standing 1,450 feet tall, it was once the tallest building in the world. Renamed in 2009, it features the Skydeck with “The Ledge,” a glass balcony offering stunning city views. #documentary #documentaryfilm #storytelling #jayveescars | Jayvee Scars

The Sears Tower, now Willis Tower, is a 110-story Chicago skyscraper standing 1,450 ft tall. Once the world’s tallest, it’s famous for its Skydeck and glass ledge views over the city. #documentary #documentaryfilm #storytelling #jayveescars | Denis Karori

3.6K views · 222 reactions | Happy 50th birthday to the Willis Tower ... aka the Sears Tower! Construction began in 1970. It took more than 2,000 workers and over 3 years to complete. Once finished, at 110 stories high, it held the title of the world's tallest building for 25 years! | Marcus Leshock | Facebook