Desc: Rigid Airships: Cities in the Sky: Directed by Nick Randall. Discover the rarely seen corner of aviation history, the incredible story of the rigid airship. Huge floating metropolises with hotels, restaurants, stores... whole cities in the sky. The revolutionary technology that lead to their ascension was in fact the biggest threat to their existence. With the Hindenburg disaster on May 6th 1937 the great story of airships would come to a sudden and dramatic end.