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Visited Northwestern University's Dearborn Observatory a couple weeks ago.  Their telescope, built in 1862, is open to the public for free viewing every Friday night. 

It's best to make a reservation from 9-10 pm.  They take walk-ins as space allows from 10-11 pm. 

The night we went, it was cloudy, so we didn't get to see the stars.  The sky cleared for a minute, so we did get to see the surface of the moon--pretty cool!  We'll definitely be back.