OK, it's silly, but it scared me as a kid.
Watch this movie late at night, in the right mood, when you're about 12years old and it's really good. Watch it older, or more cynically, andyou will probably find it silly.
It's vaguely Lovecraft-inspired, about four young people who go lookingfor an old professor they know who's living in a cabin in the woodswhile he studies "eldritch knowledge". They find his cabin crushed asif by a mighty foot (the model probably was), he's missing and hisscary book (I believe it's even titled the Necronomicon) is missing.
For the time the movie was made and the budget they obviously had, Istill find it a valiant effort.
How do YOU picture an invisible castle?