and a couple of students asked me if I wanted to go to the house and see where the shooting took place.........
.......ON THE DAY OF THE SHOOTING..........sO ............

........I walked over to the house with the students, and saw the blood on the beds, and bullet holes in the walls.

........This was nation wide news, and I was in that house several hours after the shooting took place. Same day....
a few blocks away from Crane High School.

Monument at Mt. Olive.

Kidding! The 3 towns that make up that area are all pretty nice.
I know people who live there, including a handful of musicians.
There are a couple of nice independent music stores there.
But, still no as to the most famous!

It just popped into my head, I couldn't help it. It was the place in Illinois where I discovered that Illinois had cactus.

That's it for me.

that has an historic marker on the grounds. Stillman's Run went just north of me, right through the grounds of that school.

Or the Hancock.
Though someone above said Wrigley Field, and they might be on to something.

Or the field museum of natural history.

If fooozzball fans can remember that Chicago is in Illinois, that is.

They are famous to me.

Those are the most visited places by international and national visitors, so I guess the most “famous.”

New Salem, a reconstruction of the village where Lincoln first lived when he moved to Illinois.
Allerton Park, originally the estate of a timber magnate. Now it's a sprawling outdoor art gallery that I try to revisit every few years. The monumental "Sun Singer" and "Dying Centaur" are spectacular and very different installations.

If you're talking about showing people a picture and having them guess what it is, it's probably the Chicago skyline or Wrigley Field.