Join二 upcoming events being held in Sigmaringen. Sigmaringen is a picturesque city in southern Germany along the Danube River, known for its stunning 11th-century Hohenzollern castle, the Sigmaringen Castle, which houses a museum displaying artifacts from the region's rich history, as well as for its charming old town filled with traditional Swabian architecture, making it an ideal destination for those seeking cultural and historical experiences.