Geek out at the largest science museum in the Western Hemisphere. Highlights include a WWII German U-boat nestled in an underground display ($9 extra to tour it) and the 'Science Storms' exhibit with a mock tornado and tsunami. Other popular exhibits include the baby chick hatchery, the minuscule furnishings in Colleen Moore’s fairy castle and the life-sized shaft of a coal mine ($9 extra to descend and tour its workings).
The museum's main building served as the Palace of Fine Arts at the landmark 1893 World’s Expo, which was set in the surrounding Jackson Park. When you’ve had your fill of the sensory-overload sights inside, the park makes an excellent setting to recuperate.