The horrors of the Spanish Inquisition, with its dungeon of death, and the overhanging gloom on the House of Usher demonstrate unforgettably the unique imagination of Edgar Allan Poe. Unerringly, he touches upon some of our greatest nightmares - premature burial, ghostly transformation and words from beyond the grave. Written in the 1840s, they have retained their power to shock and frighten even now.