The Brocken Spectre

"As the mountaineer reaches a high ridge, a ghostly figure towers out from the mist, its head sheathed in shimmering rings. This at one time unnerving apparition is the 'Spectre of the Brocken', so named because of sightings on the Brocken, the highest peak of Germany's Harz Mountains... But how is the ghostly figure produced?"

Find out and see more photographs. The photograph above is from the Wikipedia page on the subject.