We've all seen Darth Vader unmasked in Return of the Jedi, but this picture tells an entirely different story.
That's the late Bob Anderson. He was one of the greatest fencing experts of the last century, and choreographed swordfighting scenes for dozens of films. Here, we see him serving as a stunt double on the set of The Empire Strikes Back.
What's really fantastic about this picture isn't the behind-the-scenes aspect about it, although that is one component. Although clearly just taking a break in between shots, Anderson's pose, his downward gaze, the costume, and the smoke rising to cover his feet all combine to tell an entirely different story, perhaps of an elder lord protecting his dominion, or a sellsword past his prime about to fight a final battle. I don't use the word "epic" all too often but I think this picture fits the bill.