Time Out says
The city’s top institutions have teamed up to present Museum Week, a nine-day celebration of culture, art and learning. Chicagoans and out-of-towners alike are encouraged to take advantage of special exhibits, discounts and so much more. Illinois residents receive up to 25 percent off admission at all museums, making it easy to check out the city's very best attractions. From culture to constellations, art to animals, this is your chance to experience Chicago’s most beloved institutions in a whole new way.