How about spending Halloween in a citadel in wich Vlad the Impaller aka Dracula was born.
A top 10 Must-Do adventure according to Fodor's travel guide and Travel Channel.

Everyone knows and fears
Dracula; still everyone wants to travel to Transylvania. If you come to think about it, Dracula is actually a pretty normal, a man that parties all night long, spends all days sleeping in a coffin – (some futurist furniture don’t you think?-), never says no to a (bloody) drink. Should you want to learn the truth, be charmed by the legend and
enjoy the best Halloween party ever you’re invited to join the Halloween tour.
Learn More
here