Caption:
Croppedstereograph of the Graf Zeppelin over the Giza pyramids in Egypt, on April 10, 1931. The LZ 127 Graf Zeppelin was a German-built and -operated, passenger-carrying, hydrogen-filled, rigid airship which operated commercially from 1928 to 1937. When it entered commercial service in 1928, it became the first commercial passenger transatlantic flight service in the world.