First flight over Mount Everest (20 years before Hillary and Tenzing):
The Westland PV3 G-ACAZ closes in on Mount Everest, 3 April 1933. The photo was taken from the accompanying PV6, G-ACBR. Pilots were Lord Clydesdale and Flt. D.F. McIntyre
As a pilot, this picture makes my hair stand on end. These guys were in open cockpit biplanes at better than 30,000 feet.