The area around Palazzolo Acreide has been inhabited since ancient times. The old city was probably destroyed by the Arabs, in the first half of the 9th century. The new city was built around a Norman castle, which no longer exists. An earthquake in 1693 destroyed almost the entire city, which was slowly rebuilt in the following centuries.
Thanks to the many fascinating buildings in Baroque style, Palazzolo Acreide has been incorporated in the UNESCO World Heritage site of Late Baroque Towns of the Val di Noto since 2002.
The city has many late Baroque style churches, inculding The Chiesa Madre ('Mother Church'). The first document attesting its existence dates from 1215, when the church was dedicated to St. Nicholas. It was largely rebuilt and redecorated after the earthquake of 1693, with a Neo-classicist façade. The interior is on the Latin cross plan, with a nave and two aisles decorated with precious polychrome marbles.
References: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.