Glen N.
Yelp
I will give it five stars because it is free and clean and air conditioned, but there's not much to see. Apparently the grand, gorgeous, and historic building offer free public events (music, dance, film, lecture, art, dirty carpet Q & A) that draw hundreds of thousands of visitors, but it is otherwise uneventful. aside from the domes and a few pieces of art.
Apparently there is a Welcome Center in the north lobby. Are there multiple lobbies? And there are three spots for "a wide range of diverse and engaging exhibitions devoted to the visual arts and contemporary culture" (Michigan Ave Galleries, 1st Floor East, Chicago Rooms, 2nd Floor North, and Exhibition Hall, 4th Floor North) but I only recall seeing a few murals and some kid art.
The Grand Army of the Republic Hall and Rotunda, honoring Civil War vets and their families, was completed in 1897, the same year they put in the carpet.
There's also a Learning Lab that offers "sights, sounds, and experiences for visitors of all ages and a wide range of abilities". I saw three adults doodling. Culture!
My favorite part was a small table where you could create your own art. The cup of pens had caps without pens and pens without caps. (I love their song Safety Dance btw). I was smart enough to pull the table back to find pens, but all I found were dried out markers and the milk plastic rings the cat hit under.
It's free, so I guess it's worth the price of admission, but it shouldn't top your Must Do list.