The Graf Zeppelin flies over Chicago, Illinois. An airplane is visible below the Zeppelin on the lower left half of the image. The Graf Zeppelin, navigated by Dr. Hugo Eckener, flew around the northern hemisphere in August 1929. IMAGE: CHICAGO HISTORY MUSEUM/GETTY IMAGESThe Graf Zeppelin flies over Chicago, Illinois. An airplane is visible below the Zeppelin on the lower left half of the image. The Graf Zeppelin, navigated by Dr. Hugo Eckener, flew around the northern hemisphere in August 1929. IMAGE: CHICAGO HISTORY MUSEUM/GETTY IMAGES
The Graf Zeppelin flies over Chicago, Illinois. An airplane is visible below the Zeppelin on the lower left half of the image. The Graf Zeppelin, navigated by Dr. Hugo Eckener, flew around the northern hemisphere in August 1929. IMAGE: CHICAGO HISTORY MUSEUM/GETTY IMAGES