Robert Joe (RJ), an urban explorer and historian Dr Sam Willis are on a mission to uncover the secrets behind Heinrich Himmler’s Wewelsburg Castle in Germany. On March 31, 1945, Himmler had ordered a member of his staff on a suicide mission to blow the castle up before it fell into American hands as US troops closed in on it, but Himmler’s staff was not equipped with enough dynamite to successfully destroy the castle. It survived.

Sam and RJ investigate claims that Hitler's crushing 1940 victory at Fort Eben Emael may have been aided by a performance-enhancing drug called Pervitin.

Secret Art Fortress: A British officer makes a shocking find: at a 900-year-old castle near the front line lies a vast collection of priceless artworks.

Desperate for an escape to the mainland, a thousand men at the Burma Front take to crocodile infested waters and perish at the jaws of the hungry beasts.

Rumours swirl throughout Europe that Nazi trains full of gold looted from innocent victims and Nazi-occupied state banks were lost while crossing the continent.

Two years after it began, Japan's surprise attack on Pearl Harbor finally draws America into the fray of World War II. As their troops mobilize, the nation is gripped by the fear of another assault-this time against civilians on their own home soil. But did Imperial Japan really have a weapon that could turn their nightmare into a reality? In their hunt to uncover the extent of Japan's wartime plans, historian Sam Willis and urban explorer Robert Joe dig deep into the work of a secret research unit of the Imperial Japanese Army and their dark research into the workings of a deadly weapon.