Be careful where you walk--history's afoot! Prague in the Czech Republic is a city cloaked in mystery, with an underground to match. Medieval castles line the streets and hide dark dungeons deep below them. From quarries where Hitler may have stored his most powerful secret weapon to mines that doubled as Communist slave camps, Prague has surprising stories to tell. Join host Don Wildman as he reveals the technological marvels that allowed the construction of one city upon another-- literally.

Chicago, Illinois was once a playground for mobsters and corrupt politicians. It wouldn't be the third-largest city in the U.S. today if it weren't for the shady dealings that went on just beneath its streets.