I love House on Haunted Hill. Not that piece crap that came out in 99. I mean the black and white version starring Vincent Price. Now I love him in anything. Even Scooby Doo! Few people are as naturally creepy as Mr. Price. I once saw him read Edgar Allen Poe's Pit and The Pendulum on a bare stage and it was one of the scariest things I had ever seen.
Anyway, this movie scared the crap out of me as a kid. Particularrly the part in the cellar knocking on the walls. I screamed everytime even though I knew it was coming.
If you haven't seen it you can watch it instantly on Netflix. Here's the trailer:
