The crypt is located beneath Winterfell and expands further and wider than the castle does. Because Winterfell is built around an ancient three-acre godswood, it's thought that the walls of the crypt are weirwood roots that have turned to stone, adding to the mystical element of the underground tombs. In the book, there are rumours that the crypt is haunted by the ghosts of dead Starks, and there are hints that there's something magical housed within it (which some believe could be a dragon).