This is really much harder than I thought - all the good houses have trees at the front, so from streetview you just get a nice picture of the trees, no view of the house!
So, if I'm gonna dream, might as well dream big, right?
I could throw one HECK of a Halloween event at The Biltmore Estate in Asheville, NC. I've been there before and there are some really wonderful spaces for a party, add in the history, and it evokes just the kind of feeling I'd love to achieve.
I've also gotten to stay at an amazing "house" (might as well call it an estate!) in Maine called Ski Esta. It's near Sunday River Ski Resort. It's got an indoor pool, movie theatre, giant dining area, billiard room, lots of bedrooms and tons more -
http://www.skiesta.us/mountains/SkiEsta.shtml
It's really a perfect party house. DH & I stayed in MB 6, and yes, the shower was as phenomenal as it seems! Take a look through some of the photos & imagine how wonderfully it would look fully decked out for Halloween!
Both of these "estates" are more for their indoor spaces, but I could certainly do a graveyard in both of them. But if I wanted outside ambiance, I could easily see choosing something New Orleans-ish, all French Creole architecture with a grand courtyard space. Ahh...to dream!