Don Wildman investigates World War II bunkers in Hiroshima Japan, takes viewers below the streets of Tokyo to see how flooding is handled and what they are doing to protect Tokyo's infrastructure from the Big One!

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.