Tickets for Hop-on Hop-off Bus Chicago

It used to be the Sears Tower, but in 2009, London-based insurance broker Willis Group Holdings acquired the naming rights. No matter what you call it (everybody still refers to it as Sears Tower), it's an architectural icon. When it was built in 1973 it was the tallest building in the world. It's now 14th-tallest, but offers unrivaled views of the Windy City, and sees more than a million visitors each year.

360 Chicago (formerly John Hancock Observatory) is located in the John Hancock Center, which offers tremendous views of Chicago’s famous skyline, the glistening lakefront, and four states. The John Hancock Center is the 8th tallest building in the USA - a 100-story, 1,127-foot skyscraper piercing the skies of the Windy City. This amazing structure lets visitors zoom up 1,000 feet in just 40 seconds, thanks to the fastest elevators in North America.

The Art Institute of Chicago is one of the oldest and largest art museums in the US, attracting approximately 1.5 million guests annually. It is home to some of the world's most famous paintings including The Old Guitarist by Pablo Picasso, A Sunday Afternoon on the Island of La Grande Jatte by Georges-Pierre Seurat, Edward Hopper's Nighthawks, and Grant Wood's American Gothic, among countless other works.

The Field Museum is a natural history museum in Chicago, Illinois. As one of the largest and most impressive of such museums in the world, its houses extensive scientific specimen and artifact collections. The museum's high-quality permanent exhibitions attract up to two million visitors a year.

Chicago's premier art gallery is dedicated to showcasing art in all its forms – so expect to see painting, photography, film, music, theater and more in a stunningly designed exhibition space.

The huge Shedd Aquarium is an indoor public aquarium located in Chicago, Illinois. It is home to 32,000 animals, and was at one point the biggest indoor aquarium in the world, boasting a mighty 5,000,000 US gallons of water!

The Chicago Architecture Center (CAC) is Chicago's new all-in-one architecture experience. Visitors can learn about the city's history across two floors of interactive exhibits. It is located in Chicago, Illinois, United States.

Architects Michael Arad and Peter Walker designed the 9/11 Memorial. Their proposal, called _Reflecting Absence_, consists of two reflecting pools that sit in the footprints of the South and North Towers. They're fed by waterfalls (the largest manmade waterfalls in the United States) and surrounded by a forest of nearly 400 trees. The accompanying 9/11 Museum has an exhibition divided into three sections, the Day of 9/11, Before 9/11, and After 9/11. It uses artifacts, photos, and an extensively researched and well laid out collection to show how the events of 9/11 changed the world.

Designed by architectural firm Skidmore, Owings & Merrill - who also designed the Burj Khalifa - One World is the tallest building in the Western Hemisphere and the sixth tallest building in the world. The One World Observatory - located on the 100th, 101st and 102nd floors - doesn’t stop bringing the 'wow'; from the moment you enter the building, to its elevator rides, all the way up to the top of New York City.