It used to be a museum owned by the House of Welf, but since 2011 it serves as a private residence of Ernst August, the Crown Prince of Hannover.
Wikipedia (German) http://de.wikipedia.org/wiki/F%C3%BCrstenhaus_Herrenhausen-Museum
Address Herrenhäuser Straße 4, 30419 Hannover, Germany
Coordinates 52°23'31.188" N 9°41'33.501" E
