Wolfenbüttel Castle is a historic building located in the town of Wolfenbüttel, Germany. Originally constructed in the 16th century, it served as a residence for the Dukes of Brunswick. The castle features a blend of architectural styles, including Renaissance and Baroque elements, reflecting its long history. Today, Wolfenbüttel Castle houses the Herzog August Library, one of the most important libraries in Germany, known for its extensive collection of manuscripts and rare books. The castle is a popular tourist destination, offering guided tours that showcase its rich history and beautiful interiors.