A look at what went into building Hitler's infamous hideouts, including the fortified Wolf's Lair, the Fuhrerbunker and the alpine retreat known as the Eagle's Nest.

Hitler's megalomania led him to construct the ultimate deep-sea destroyer, the largest tank the world has ever seen and a fighter jet that inspired a revolution in aerial warfare.

A look at Hitler's deadly defences. The Siegfried Line held off US forces for six months, while the ambitious Atlantic Wall faced the ultimate test on D-Day.

The story of the Nazi geniuses who created Hitler's deadly weapons of vengeance, including the world's first-ever cruise missile and long-range rockets.

The story of history's greatest tank battle and how a vengeful Soviet army made the Germans fight for every inch of ground from the Baltic to Berlin.

Hitler fast tracked a revolutionary air force in the build-up to WWII, creating two deadly new bombers designed to annihilate the enemy from above.

Built to hold back the Allies, Hitler set up colossal defences across Norway's coast and lines that stretched across the entire Italian peninsula.

As US forces spread across the Pacific, Japan threw suicide bombers into action, built the world's biggest battleship and started building deep beneath Okinawa.

The story of propaganda maestro Joseph Goebbels and Holocaust architect Heinrich Himmler: two men who built one of the largest social megastructures ever - Nazi Germany.

Hitler orders the largest battleships ever seen. But how long will they last? He also demands fortified bunkers in a bid to protect his U-boats from the Allies.

Having smashed through Poland and France, the German Panzers finally met their match when they took on the Soviet Union's war-winning T-34 tanks.