Our guest is Lee Colvin, who's written a book chronicling his travels around the world in pursuit of the football's biggest rivalries. We discuss Boca-River, Madrid-Barça, Ajax-Feyenoord, Red Star-Partizan, Rangers-Celtic, and many more.

We talk to Chris Hough, who runs the Lost in Football Japan blog, about groundhopping around the country. 

We unearth a fascinating and diverse football culture, so download and enjoy a trip to the Land of the Rising Sun...and the J-League.