With so many shows playing at this year's Philadelphia Fringe Festival, it's tough to know what to check out.  And while "Experiment 39" opened and closed this past weekend, we thought it was so unusual that it was worth talking about.   

It's put on by the "Institute for Psychogeographic Adventure," which billed it "a most unusual walking tour" offering a "personalized journey through Old City."  

Who could resist that?  Certainly not NewsWorks Tonight producer Shai Ben-Yaacov who checked out the show during its limited run.

Listen to the audio and follow along with the interactive map.