Mysteries at the Castle: Real Frankenstein, Mummy Curse, Man in the Iron Mask

On a rocky outcrop in central Germany stands the forbidding ruin of a monstrous castle where a scientist conducted a series of sinister experiments that inspired a literary masterpiece. Hidden within one of England's most famous country manors is the story of long buried Egyptian treasure and the deadly curse unlocked by its discovery. And half a mile from the coast of France is the tiny island of Sainte-Marguerite, home to the forbidding Fort Royal, where a mysterious masked prisoner was locked up for decades, his identity hidden from the world.