Marksburg is a medieval castle located in the town of Braubach, Germany, overlooking the Rhine River. Built in the 12th century, it is one of the few castles along the Rhine that has never been destroyed. The castle features well-preserved architecture and offers visitors a glimpse into the history of the region. Today, Marksburg serves as a museum, showcasing artifacts and exhibits related to medieval life. It is part of the UNESCO World Heritage Site known as the Upper Middle Rhine Valley, which highlights the cultural significance of the area and its historical landmarks.