Located in Augusta, Sicily, this dirigible hangar's history stretches back to World War I. It was constructed on the eastern coast of Sicily, an ideal place to house planes or Zeppelins that would have monitored the Medditerannean Sea for German U-boats. Today, the Augusta Hangar is the only remaining example of a reinforced concrete airship hangar left in the world. Its 15 reinforced concrete frames rise 31 meters into the air, as do the hangar's unique folding doors. It can house airships up to 12,000 cubic meters.