Runkel Castle is a historic fortress located in the town of Runkel, Germany. It was built in the 13th century by the Counts of Diez and served as a strategic stronghold overlooking the Lahn River. The castle features impressive stone walls, towers, and a picturesque setting that attracts visitors. Today, Runkel Castle is partially restored and offers guided tours, allowing guests to explore its rich history and architecture. The site also hosts various cultural events throughout the year, making it a popular destination for both locals and tourists interested in medieval history.