This article is from the Disney's Haunted Mansion FAQ, by Don Bertino bertino@netcom.com with numerous contributions by others.
No.
The actual house is right next to the edge of the park. The loading area
and subsequent ride are actually "outside" the park in a big
warehouse-style building.
In CA, you go down so that they can get you under the railroad
tracks that circumscribe the park's perimeter.
 
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