Zombies are the monsters of the 21st century, and America's major contribution to horror. What set off zombie fever? All roads lead to George Romero, who made zombies a metaphor for social ills.

Modern vampires come in many guises, but they all address our fascination with sex and death. From the ghastly Count Orlok to the glam vampires of True Blood, John Landis, Josh Hartnett, Mick Garris and others take a look at why thirsty fiends are endlessly appealing.