"Schloss Greinburg on the Danube In a country with so many castles, Schloss Greinburg doesn’t rank as one of the most awe-inspiring. It is, however, particularly notable for two things. Greinburg is considered Austria’s oldest residential castle (origins dating back to 1488) and it has been owned by the House of Sachsen-Coburg & Gotha, arguably the most influential European royal family, since 1823. The castle was even briefly owned by Queen Victoria of England. Highlights of a guided tour include the rich stucco ceiling, grand chandeliers and ruby red walls of the Dining Room, and splendid courtyard, and numerous portraits showcasing their royal connections throughout the castle. Views from the castle overlook the small town of Grein and the Danube."