Laubenbergerstein is a hilltop castle, likely established in the 12th century by the Bishops of Augsburg, aimed to safeguard the crucial Iller River crossing and associated customs station. Initially occupied by the Laubenberg family, the castle experienced conflicts, including attacks in 1449 by Graf Hugo XIII. von Montfort. Kaspar von Laubenberg initiated substantial expansions after 1450, resulting in the dominant artillery keep. During the German Peasants' War in 1525, the castle was seized and weapons were stolen.
In 1559, the Laubenberg family left the castle for a newly built residence in Rauhenzell. By 1629, the castle was already considered a partial ruin. Margaretha von Laubenberg accelerated its decay in 1641, selling roofing tiles. In 1647, the fief was revoked, and by 1806, the castle came under Bavarian rule. In 1977, the Immenstadt Heritage Association acquired the ruins and began restoration efforts. The castle, made of local materials, is now accessible to visitors. The imposing artillery tower, constructed after 1450, dominates the castle's appearance and can be climbed on special occasions.
Duino Castle was built by the Wallsee family in 1389 on the cliffs overlooking the Gulf of Trieste. It replaced an older castle from the 11th century. Over time, the Wallsee family disappeared and the castle, after having been used as a prison, became the residence of the Luogar and Hofer.
At the end of the 19th century it became the property of Prince Alexander von Thurn und Taxis from the Czech branch of the House of Thurn and Taxis. It remains with the family to this day with his great-grandson Prince Carlo Alessandro della Torre e Tasso, Duke of Castel Duino the current owner. The castle has been opened to the public as a museum and park.