Nicholas Cage bought a castle in Etzelwang bei Amberg because the ancestors of his mother, Joy Vogelsang, "are all from good old Bavaria." In fact, Nic's great-great-great-grandfather Louis Vogelgesang is the only one I can identify who came from Bavaria.
Maybe Nic'll just buy a château in Alsace in memory of his great-great-great-grandmother Josephine and scoop up a Schloß or two in Prussia in memory of his mother's Muentnich and Daum ancestors. He's got a number of manors in the British Isles coming to him, too, what with his mom's Lewis, Caldwell, Ramsey, and Lockhart ancestors.
And that's just on his mom's paternal side.
I don't know anything about the background of Nic's maternal grandmother. She is 91 and living in Los Angeles so I could just ask her. Though she goes by Louise, Ancestry.com says her name is Della Murray, which, now that I think of it, does not sound particularly Bavarian.
Hat tip to The Genealogue.