Skydeck Chicago - Willis Tower

"At 110 stories and 1,730 feet tall, the former Sears Tower, designed by Skidmore, Owings & Merrill in 1974, was the world's tallest building until 1996." Full review

"Designed by renowned architects Skidmore, Owings & Merrill, this 1,353-foot landmark tower is one of the five tallest in the world."

"Despite the fact that this observation area on the 103rd floor is called a "skydeck," you can't actually walk outside, but the panoramas are impressive nonetheless." Full review

"Think of it as the world’s tallest recycling effort. Or maybe it’s just an exceptionally ambitious retrofit." Full review

"This 1973 landmark put the city in an uproar when insurance broker Willis Group Holdings Ltd acquired the Sears Tower naming rights in 2009." Full review