Travelling American rock historian Brett Meisner decided, one day in 1997, to stop by his grave at the Père Lachaise cemetery in Paris to pay respects to his hero.

As he did so, he asked his assistant to take a souvenir photograph.

Almost as soon as it as taken, the picture was forgotten.

But five years later, they found it...and noticed something that would shock the world: A chilling image in the background of, what appeared to be, the dead singer himself.

Crowds of people had been there at the same time - up to 1,000 still visit the singer's grave daily - but nobody else recorded the strange image.

Word quickly spread across the internet. The Morrison ghost photograph became notorious and, keen to know what had happened, Meisner agreed that both the picture and negative should be sent for extensive analysis.