The Old Stone Bridge is a historic structure located in Germany, specifically in the city of Regensburg. Built in the 12th century, it spans the Danube River and is renowned for its impressive medieval architecture. The bridge was a vital trade route during its time, connecting various regions and facilitating commerce. This bridge features 16 arches and is approximately 300 meters long. It was constructed using local limestone, showcasing the craftsmanship of the era. The Old Stone Bridge remains a significant landmark and is recognized as a UNESCO World Heritage Site, attracting visitors interested in history and architecture.