Early next year, Patricia Hearst will host a two-hour Travel Channel documentary about her late grandfather William Randolph Hearst's imposing California estate, "Inside San Simeon," its producer George Merlis has told PEOPLE.com. Although up to one million visitors a year take the public tour through Hearst Castle, the younger Hearst -- these days, best known for her roles in John Waters movies -- will take viewers behind the scenes where the tours don't go and will tell the stories the tour guides don't tell. (Also in the special: author David Nasaw, whose new biography of the publishing magnate de-demonizes the image most people have from the fictitious Orson Welles classic, "Citizen Kane.") Although Patricia never met her grandfather, who died in 1951 (before she was born), as a child she spent summers at San Simeon.