keep it simple. don't think too hard. you can either just fingerspell it as "crypt" or... simply sign it like what I described above. all you gotta do is "draw a picture" and describe it.
a sign for words like grave, crypt, graveyard, etc. is pretty much same thing. you just gotta add more description to it like big house (mansion) and underground and we can easily figure out what you're trying to say. if some people are clueless, well they're clueless anyway... just like some hearing people may not have heard of the word "crypt" or never knew there's such thing like a crypt in basement
Lol yeah, good point. Thanks!
The reason I asked is b/c I was telling a friend about the old HBO show "Tales From The Crypt" (1989 to 1996) and I bought the complete set of DVDs last year - it's still my fave show along with NBC's Friends and a few others.
Jiro's explanation is good and would work.