Globetrotting, Identify This, Untold History
Episode: 4x01 | Airdate: Sep 15, 2014
Episode: 4x01 | Airdate: Sep 15, 2014
Episode: 4x02 | Airdate: Sep 22, 2014
Episode: 4x03 | Airdate: Sep 29, 2014
Episode: 4x04 | Airdate: Oct 6, 2014
Episode: 4x05 | Airdate: Oct 27, 2014
Episode: 4x06 | Airdate: Nov 3, 2014
Episode: 4x07 | Airdate: Nov 10, 2014
Episode: 4x08 | Airdate: Nov 17, 2014
Episode: 4x09 | Airdate: Feb 2, 2015
Episode: 4x10 | Airdate: Feb 9, 2015
Episode: 4x11 | Airdate: Feb 16, 2015
Episode: 4x12 | Airdate: Feb 23, 2015
Episode: 4x13 | Airdate: Apr 6, 2015
Episode: 4x14 | Airdate: Apr 13, 2015
Episode: 4x15 | Airdate: Apr 20, 2015
Episode: 4x16 | Airdate: Apr 27, 2015
Episode: 4x17 | Airdate: May 4, 2015
Episode: 4x18 | Airdate: May 11, 2015