This is what is left of a V2 (A4) rocket engine from the second world war. It sits, rotting in a sub terranian concentration camp known as Mittlebau Dora. Tens of thousands of forced laborers first built the huge complex underground, and then built the rockets. After the war the tunnels enterences were destroyed...sealing rocket engines, tools, and personal effects for more than 60 years. Today, you can tour a portion of the tunnels.