One of the biggest mysteries in York is that of Mary Nasson. Some sources claim that Mary was an old woman who was hung as a witch in the 1700's, and that her last name is Jason. Legend claims that Mary's ghost has been seen strolling through the graveyard, the noose still around her neck. Another story portrays her as an herbalist who helped her neighbors whenever they were sick. So, was she a witch or a healer?