Google Doodle Honors Pioneering Willis Tower & Hancock Center Designer Fazlur Rahman Khan

Here's What Willis Tower Will Look Like After $500M Renovation

Hancock Building Could Lose Its Signature Name

Willis Tower Could Sell For $1.5 Billion

The Ledge At Skydeck Chicago Reopens

Willis Tower 'The Ledge' Cracks And Shatters During Family Visit Wednesday Night [UPDATE]

So Chicago Doesn't Have The Tallest Building In North America Anymore. Big Deal!

Photos & Videos: Epic Lightning Over Chicago

Ironworker Hung Mitt Romney Banner From Sears Tower Antenna

Video: Crews Install Antenna On Top Of Sears Tower

United Airlines Moving Corporate Headquarters To Sears Tower

Crews Remove Antenna From Top Of Sears Tower In Gutsy Helicopter Operation

One For The Road: The Day The Sears Tower Opened

Crafting Chicago Architecture From Everyday Items

Willis Tower Owners Testing Waters On Putting Building Up For Sale

Man Arrested in Willis Tower Threat

Bush: Sears Tower "A Genuine Target" On 9/11

Second City Syndrome Incarnate: ’85 Bears

Chicago Will Be Back to 2nd with Skyscrapers

Extra, Extra

The Greening of Willis Tower

Chicagoist Podcast 7/20 - Wherefore Art Thou, Fields and Sears?

Mayor Daley Weighs in on Willis Tower

In Pictures: The Willis Tower Changeover