Slick, shiny and imposing, skyscrapers like Aon Center are marvels to behold. Remember to stop, tilt your head back and admire this imposing monolith!
Sometimes it's the places that don't cost a dime that make the best travel memories. And you're bound to make a few at this free architectural wonder in The Loop. When you've seen all you want to at Aon Center, swing by Wrigley Field, Millennium Park and Willis Tower.
