What is the tallest building in the city known as the Second City and the Windy City?
Willis Tower
One World Trade Center
One World Trade Center
Willis Tower
One World Trade Center
One World Trade Center
The Willis Tower
Willis Tower
One World Trade Center
Chicago Tribune Tower
The Willis Tower
Willis Tower
One World Trade Center
Wrigley Building
Chicago Tribune Tower
One World Trade Center
The Willis Tower
Willis Tower
Wrigley Building
The Chicago Tribune Tower
One World Trade Center
Chicago Tribune Tower
The Trump Tower
Wrigley Building
The Willis Tower
One World Trade Center
Willis Tower
The Chicago Tribune Tower
Wrigley Field
Wrigley Tower
Wrigley Building
Chicago Tribune Tower
The Trump Tower
One World Trade Center
The Willis Tower
Wrigley Field
O'Hare Tower
The Trump Taj Mahal
Trump Tower
Wrigley Building
Willis Tower
The Chicago Tribune Tower
The One World Trade Center
Wrigley Tower
O'Hare Center
One World Trade Center
World Trade Center
Wrigley Field
Trump Tower
Chicago Tribune Tower
O'Hare Airport
The Trump Tower
Wrigley Building
The Willis Tower
The One World Trade Center
O'Hare Tower
O'Hare Center
One World Trade Center
World Trade Center
The Trump Taj Mahal
The Chicago Tribune Tower
Willis Towers
Willis Tower
Wrigley Field
Wrigley Tower
Trump Tower
O'Hare Airport
O'Hare Center
Wrigley Building
World Trade Center
One World Trade Center
Chicago Tribune Tower
O'Hare Tower
The Trump Tower
The Trump Taj Mahal
Trump Tower
The Willis Tower
Wrigley Field
Empire State Building
The Trump International Hotel
O'Hare Airport
The Chicago Tribune Tower
Wrigley Tower
Willis Tower
O'Hare Center
Trump Tower
One World Trade Center
Wrigley Building
Wrigley Field
United Center for the Arts
World Trade Center
O'Hare Tower
The Trump International Hotel
Burlington Building
Chicago Tribune Tower
O'Hare Airport
The Trump Tower
The Willis Tower
Trump Tower
O'Hare Center
The Trump Taj Mahal
One World Trade Center
Wrigley Building
The Chicago Tribune Tower
Wrigley Field
Wrigley Tower
United Center for the Arts
The One World Trade Center
Willis Tower
The One Chicago Loop
World Trade Center
The Trump International Hotel
O'Hare Tower
Trump Tower
O'Hare Airport
Burlington Northern Building
O'Hare Center
The Trump Taj Mahal
One World Trade Center
The Willis Tower
Wrigley Field
Chicago Tribune Tower
The Trump Tower
United Center for the Arts
The One Chicago Loop
Burlington Building
Wrigley Building
World Trade Center Chicago
Trump Tower
The Chicago Tribune Tower
Wrigley Tower
O'Hare Airport
World Trade Center
O'Hare Tower
Willis Tower
Burlington Northern Building
One World Trade Center
The Trump Taj Mahal
The Trump International Hotel
Burlington Tower
Wrigley Field
O'Hare Center
Trump Tower
United Center for the Arts
Wrigley Building
Sears Tower
World Trade Center Chicago
United Center
The Willis Tower
One World Trade Center.
Chicago Tribune Tower
The Trump Tower
Burlington Building
O'Hare Airport
One World Trade Center
Burlington Northern Building
The Trump International Hotel
Trump Tower
Willis Tower
Wrigley Field
Wrigley Tower
World Trade Center Tower One
O'Hare Tower
The Trump Taj Mahal
Wrigley Building
United Center
World Trade Center Chicago
O'Hare Hotel
Sears Tower
The Willis Tower
O'Hare Center
The One Chicago Park Place
The One Chicago Loop
The One Chicago Loop Tower
Trump Tower
One World Trade Center
Burlington Northern Building
Burlington Building
The Chicago Tribune Tower
Wrigley Field
O'Hare Airport
United Center
Chicago Tribune Tower
The Trump Tower
Willis Tower
Burlington Tower
One World Trade Center.
Wrigley Building
World Trade Center Chicago
Wrigley Tower
Trump Tower
The Willis Tower
O'Hare Center
The Trump International Hotel
O'Hare
United Center
Burlington Northern Building
O'Hare Airport
One World Trade Center
Burlington Building
O'Hara Center