Château des Rohan
Mutzig, France
The Château des Rohan ("Castle of the Rohan") is a former castle and weapons factory now serving as a museum and cultural centre in the French town of Mutzig, Bas-Rhin, Alsace. The castle, whose structure goes back to the 13th century, belonged to several families of noblemen and bishops of Strasbourg before being turned into a rifle factory after the French Revolution. The castle is most famously associated with the House of Rohan and the Chassepot rifle.
Palace data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).