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 In 1647, the fief was revoked, and by 1806, the castle came under Bavarian rule.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.
The Jan Hus Memorial stands at one end of Old Town Square. The huge monument depicts victorious Hussite warriors and Protestants who were forced into exile 200 years after Hus, and a young mother who symbolises national rebirth. The monument was so large that the sculptor designed and built his own villa and studio where the work could be carried out. It was unveiled in 1915 to commemorate the 500th anniversary of Jan Hus' martyrdom. The memorial was designed by Ladislav Šaloun and paid for solely by public donations.
Born in 1369, Hus became an influential religious thinker, philosopher, and reformer in Prague. He was a key predecessor to the Protestant movement of the sixteenth century. In his works he criticized religious moral decay of the Catholic Church. Accordingly, the Czech patriot Hus believed that mass should be given in the vernacular, or local language, rather than in Latin. He was inspired by the teachings of John Wycliffe.