Brandenbourg is crowned with the ruins of a castle whose origin goes back to the 10th century.

Brandenbourg Castle (French: Château de Brandenbourg), now a ruin, is located on a promontory some 70 metres above the village of Brandenbourg in north-eastern Luxembourg. It has a history going back to the 9th and 10th centuries when there was a wooden fort on the site. The 13th century keep, now 11.9 metres high, used to have four floors, only three of which remain. Around 1687, the French destroyed the external walls of the castle which subsequently fell increasingly into ruin. It is now owned by the family du Fays – van Delft. The owner signed an emphyteutic lease (1997) with the State of Luxembourg permitting the state to take care of the castle (consolidation and archaeological excavation work).