Apparently, the tour at Sleepy Hollow Cemetery not only points out the crypt whose exterior served as the Collins Mausoleum in
House of Dark Shadows, but it also takes visitors inside.
A friend just told me about a segment on cemetery tourism, hosted by Rita Braver, that was part of the recent
Sunday Morning Halloween show and that eavesdropped as a Sleepy Hollow tour guide stood in front of the crypt and told visitors, "This became the home of Barnabas Collins the vampire. ... Come in!"
The entire segment has been uploaded to YouTube--
Tombstome Tourism: The Creepiest Cemeteries-- and that part is 1:08 into the video. Enjoy!