The earliest records about the Alu manor date back to 1409. The present grand Neo-Gothic main building was erected in 1862-1875, when the manor was owned by the von Lilienfelds. With its balustrade and corner tower, it bears similarities to a medieval castle. The building was renovated at the beginning of 2000s and now serves as a training centre of the National Defence League.
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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.