Authorities are stepping up their investigation into the mail bombs addressed to Chicago synagogues, and they weren't the only Chicago locations showing up on al-Qaeda's radar.

Willis Tower is visible through the most iconic element of the new 606 trail — a rebuilt bridge over Milwaukee Avenue, painted dark red like the historic bridges over the Chicago River.

FILE – A Nov. 7, 2013 file photo shows a view of Chicago’s 110 story, 1,450 foot Willis Tower. Blackstone announced Monday, March 16, 2015 that it is buying Chicago s Willis Tower, once called the ...

Willis Tower, downtown’s 1,450 ft. stack of architecture, engineering, commerce and civic pride, turns 40 next year. If you are of a certain age, that milestone might be as jarring as the fact ...

Willis Tower! It's weird, right? The name change? As a kid, the Sears Tower's name was something that was completely unique from the mega clothing store. It never occurred to me that the Sears ...

Willis Tower and the Chicago skyline on Nov. 12, 2013, the day the tall buildings council announced that One World Trade Center would become the country’s tallest building when completed.

Power outage at Willis Tower leaves building looking ‘disappointed,’ just like everyone else in 2020 Chicagoans who noticed that their beloved “Sears Tower” had lost its twinkling lights ...

CHICAGO (WLS) -- The iconic Willis Tower will get a major makeover. The city announced Wednesday a $500 million plan to transform the nation's second tallest building. Since 1973, the crown jewel ...

The Sears Tower, right, begins to take shape in downtown Chicago in the early 1970s. Workers take in the view from the 80th floor of the Sears Tower under construction on November 6, 1972. The ...