With the first stone keep construction started in 1100, and expanded into a more complete castle structure around 1117, the Marksburg is a castle above the town of Braubach in Rhineland-Palatinate.
It was built to protect the town and enforce river tolls. The castle was first mentioned in documents in 1231 and was later rebuilt by subsequent noble families.
Out of the 40 hill castles between Bingen am Rhein and Koblenz the Marksburg was one of the only two which had never been destroyed, and the only one that had never fallen into disrepair.