See Facebook for opening times! Castletown D-Day Centre is an authentic recreation of the busy wartime dockyard on the Isle of Portland, from which in 1944, thousands of American troops of the 5th US Corps and the US 1st infantry, embarked, bound for the heavily defended beaches of Nazi occupied France. The interactive World War 2 museum features an impressive array of original artifacts, weapons and wartime vehicles, including a full size replica Spitfire, a Bofors 40mm gun and even a restored Sherman tank. To enhance your D-Day WW2 history experience, we actively encourage our visitors to handle the weapons, climb on our vehicles and even dress up in authentic World War 2 uniforms.