Now that the dog days of summer are abundant, so are free Chicago museum days. Whether you’re looking for a cheap activity for the kids or craving a new experience, the city’s museum scene has got something for everyone. Some Chicago museums and cultural institutions are always free for police, teachers, active-duty personnel and veterans of the U.S. military or children under the age of 12. Be sure to check online for which museums require a reservation, too. The Art Instit