A full series of History Hit YouTube exclusive videos on the most fascinating megastructures of the Second World War. Join presenters Dan Snow and James Rogers as they travel across Europe to discover the monumental physical remains of World War Two.

In episode one, James heads to Normandy to explore shipwrecks left over from the Dunkirk evacuation of 1940. He then sees the huge bunkers of Hitler's Atlantic Wall on a stretch of coastline in Denmark, entering the ruins to see German graffiti and other evidence of the soldiers' daily lives.

Dan Snow then lands in the Channel Islands, exploring the warren of World War Two defences built by the Wehrmacht on Alderney. The concrete bunkers and tunnels even incorporate earlier defences built during the Napoleonic Wars.

James then visits one of the most impressive underground fortresses in the world, Eben-Emael in Belgium. This impressive subterranean megastructure was built to prevent a land invasion, but was captured in one of the first attacks by German paratroopers.

Moving forward to D-Day and Operation Overlord, James views the surviving remnants of the Mulberry Harbours in Normandy, used to unload and embark supplies for the Allied liberation of Europe.

In the final episode, James uncovers the remnants of Hitler's Siegfried Line in Hurtgen Forest, one of the last obstacles the Allies had to negotiate before they entered the German heartlands.

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00:00:00 Introduction
00:01:05 Wrecks of Dunkirk Evacuation
00:10:16 Hitler's Atlantic Wall (Denmark)
00:22:37 Alderney WW2 Defences
00:42:15 Eben-Emael Fortress
00:50:40 Normandy Mulberry Harbours
00:58:03 Hitler's Siegfried Line