Assembling the Buran spacecraft; while the American Space shuttle needed a pilot on board, the Buran was traveling with autopilot, cutting-edge for the time, USSR, 1980s.
Arguably the most intelligent photo ever taken: Solvay Conference on quantum mechanics at the Institute International de Physique Solvay, Brussels, Belgium, in 1927. 17 of the 29 attendees were or became Nobel Prize winners.