Ruins Port Winston in Metropolitan France

You're standing on the coast at Arromanches, in Normandy. Look out to sea. Those dark blocks in the water are what's left of a harbour that shouldn't really have existed. After the landings of 6 June 1944, the Allies had a big problem: there was no proper port here. Ships full of tanks, fuel and food had nowhere to dock. So the British built their own, back in England, and towed it across the Channel in pieces. The codename was Mulberry. This one was Mulberry B, better known as Port Winston.