The Second City

Even if you know nothing about improv, chances are you've heard of Second City. This is the place that put both sketch and improvised comedy on the map while launching the careers of many distinguished comics including Bill Murray, Tina Fey, Chris Farley, John Belushi, Joan Rivers, Stephen Colbert and Steve Carell. Mainstage revues are occasionally stodgy, but most shows are still top-notch.