If you are only going to visit one Chicago theater when visiting, this would be a good choice. Second City has produced more actors and comedians than anyplace; come and see the new batch starting out here.
Bill Murray, the late John Belushi, Dan Aykroyd, Alan Arkin, Mike Myers, the list of Second City alums is long and distinguished.
And it somehow manages to maintain its vitality, now having survived serveral changes in ownership, managment, etc.
It is exciting to sit at the cramped tables and hear the piano player start up and watch the actors come out on a naked stage with minimal props.
Next thing you know you are falling off your seat laughing and trying to remember the great lines so you can tell your friends.