Well in my mind they would need Darkness in the house to be the overseer of evil. I see a dilapidated mini-USF arch as the facade with a lot of props from years past. And then, in between each portion of the house, Darkness will appear and kind of tell a corny joke or explain what year you're about to walk into. And at the end, you walk down a WELL LIT pathway like a museum, surrounded by characters from the past as they are behind glass or something trying to get at you. Darkness comes out at the end of the tunnel with a chainsaw minion and you get chased out by the roar of the saw. The end.
House would be really long and by all definitions, MEGA.