1945 ... Hiroshima bomb 'Little Boy'

... top photo is of the actual weapon, in the sunken loading pit, before it was jacked up into the bombay of the B-29 Superfortress. Second photo is of a 'Man of the Future' viewing a replica, 60 years later, at the Atomic Weapons Museum in New Mexico.

http://en.wikipedia.org/wiki/Little_Boy