Shedd Aquarium

Nestled in the South Loop, the John G. Shedd Aquarium is one of the world's largest indoor aquariums, housing more than 8,000 aquatic animals such as piranhas, dolphins and beluga whales. Get a close-up look at animals found in the Amazon River or explore a Caribbean coral reef full of sea turtles, stingrays and sharks. You can also look on as staff members feed and swim among the aquarium's underwater critters.

Some say the only real problem with the Shedd Aquarium is its high cost of admission: Day passes for adults cost more than $25. But if you're planning on hitting lots of the city attractions, you can save money by purchasing either a Chicago CityPASS or Go Chicago Card, which offer discounts on some of Chicago's top attractions. Check out the aquarium's website for more information on exhibits, hours of operation and admission costs.