Rabensburg Castle stands as one of Austria's earliest and most impressive medieval fortifications, built between 1050 and 1074 by the Lords of Raabs in the market town of Rabensburg on the Czech border. The castle features a distinctive elongated ground plan that follows the rocky ridge above the Thaya River, with voluminous towers and well-preserved walls, stone spiral staircases, and a 40-meter-deep well. Notable architectural elements include vaulted chambers, Gothic frescoes, and the castle chapel. The structure was extended during the 17th century, adding further layers to its historical significance. Today, the castle remains inhabited and welcomes visitors through guided tours, allowing travelers to experience the authentic medieval atmosphere and detailed preservation of this riverside fortress.