It was said to be one of the best photos of a UFO, and a poster-size image of it hung on a wall of Britain's Ministry of Defence. But then, at some point between 1991 to 1994, it vanished, gone, never to be seen again.

On the day in 1991 that Nick Pope interviewed for the position of chief of the Ministry of Defence's UFO office, he could not help but notice the UFO image on the wall. "I went in for an informal interview, and anyone sitting in that office found their eyes drawn to that image, " Pope told The Huffington Post.

Other original pictures, negatives and the wall poster somehow vanished in the 1990s. Only a Ministry of Defence line drawing, below, remains.

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