Once again stealing from Jack.
Precis: A funhouse megadungeon run by a horror host. Mummies, vampires, werewolves, aliens, and human flies all rub shoulders in Frankenstein's lab.
Conspectus: The more-or-less ruined Castle Drakenstein is home to a foppish, capricious lich whose only pleasure in life comes through torturing adventurers; peasants fear to tread in the shadow of the tower; caverns contain fog-bound, haunted forests where the moon is always full; mad scientists have moved in to conduct their hideous experiments; an ancient pharaoh's tomb has been rebuilt, stone by stone, and filled with the appropriate Egyptian horrors; satanic cults hold metal concerts; medusa heads!; Atomic horror monsters made by Frankenstein; technicolor dungeon lighting; regular monsters forced to dress and act the part by the insane Baron; lots and lots of terrible puns
Taste, Sound, Image: Movie popcorn and Coca-Cola, The Cramps "God Monster," Tales from the Crypt (TV show or comics, your pick).