Take Tuesdays Off - Free admission to Adler Planetarium
Heads up - literally and figuratively! Adler Planetarium is free on Tuesdays through the end of the year. For an additional three whole dollars, you can see the original Atwood Sphere. This is the oldest planetarium in Chicago and was built in 1913. It's a sphere with holes drilled in where the brightest stars are located.



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