On its site of Quirinus Chapel was originally a heathen shrine which the Romans later worshipped as an early Christian sanctuary. Since the 11th century the site has been consecrated to Saint Quirin and from the beginning of the 13th, services were held in the two caves of the chapel. The Gothic pilgrimage chapel, partly hewn in the rock, was erected in 1355, while the roof and the small belltowers were added afterwards, at the end of the 19th 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.