The Roman Catholic Church of St. Catherine was built in the years 1488-91 in late Gothic style. Its nave is topped by a star-shaped vault. The crypts below the church contain burial places of prominent citizens and vogts of the town. The surviving original Gothic inventory includes a stone baptismal font, a 15th-century cross, and a late Gothic sculpture of the Virgin Mary. The organ is from the end of the 18th century.
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.