Like many Big Ten schools, Illinois has an old-fashioned student union with lots of activities going on. The next two photos show the Illini Union from the front and back.
And by "activities" in the union, we mean bowling!
The back of the Illini Union faces onto the Main Quad...
Opposite the union on the other end of the quad is the domed Foellinger Auditorium, which includes the largest lecture hall (capacity 1,361) on the entire campus.
A picture of Foellinger's glorious interior is available here.
Finally, here in the Land of Lincoln, we have Lincoln Hall, also surrounding the quad.
A slideshow display of Lincoln Hall's interior is available here.