Yes, Eltz Castle (Burg Eltz) is unique because it has been owned and occupied by the same family, the House of Eltz, for 33 generations—over 850 years. Currently, the castle is owned by Karl Graf von und zu Eltz-Kempenich. While the family lives in a private section of the castle that is not open to the public, they maintain the historic structure as a "joint-heirship" castle (Ganerbenburg), which was historically divided into several parts to house different branches of the family simultaneously. Because the family still uses it as a residence, visitors are only allowed into the "museum" areas of the castle via guided tours. This continuous habitation is the primary reason the castle was never destroyed by war; it has remained a meticulously cared-for private home since the 12th century, unlike many other German ruins.