Sonoma has always been known for fine wines.
But fine 'spirits'? Now that is something new.
People swear the Bartholemew Park Winery is haunted.
The source of the ghost rumors go back to when it used to be a hospital.
Some believe the spirit of those who died there still remain.
Paranormal investigator Jeff Dwyer has been looking into it.
We listened to recordings of what he claims are the supernatural.
He captured something that sounded like water dripping in an metal pipe.
He claims his recording also captured someone saying, "I died."
Dwyer's adventures into the other side are chronicled in his new book, "The Ghost Hunter's Guide to California Wine Country."