Sometimes, it's horrific enough just to be in your own skin, so imagine the shock of seeing your double! The German word doppelgänger describes just that: a mysterious twin - perhaps real, perhaps buried only in the dark recesses of your mind. Mythical doubles are rumored to live among us, bending perceptions and testing identities. Some have even appeared as eerie omens or harbingers of doom.
History is full of such sightings, and in many cases, public figures have been involved. Abraham Lincoln was reportedly visited by his double on the night of his election. Writer Johann Wolfgang von Goethe was haunted by one, and so was Russia's Catherine the Great. Author Guy de Maupassant interacted regularly with his spook; it even dictated a story to him! Read on for a list of mysterious doubles from history.