Cairo from 800m, 1930 El Tulum mosque can clearly be seen to the front of the image. Mittelholzer’s extensive travels, including trips to what is today Iran, Ethiopia, and the Svalbard Islands of northern Norway, as well as his 1926–7 trip to Africa on the seaplane Switzerland, made him a household name both in aviation and photography. All photographs: ETH-Bibliothek Zürich, Bildarchi