One hundred years ago today, the SS Eastland sank in the Chicago River. Nearly 100 newly found photos from the Chicago Tribune offer a new look at Chicago's deadliest tragedy.  

In his newest WTTW special, Geoffrey Baer takes a real time machine to places all over Chicago and looks through it to see things that are now long gone. Geoffrey joins us Tuesday just minutes before the debut of the program to give us a sneak peek. Watch a video preview.