The Cathedral Church, also known as St. John's the Baptist Church, was originally built between 1098 and 1132. It has been almost entirely rebuilt, following the original design, after the earthquake in 1743. Inside one can admire a polychrome mosaic from 1178 and a crown in wood from 1594.
Here Ruggiero, son of Tancredi, was crowned King of Sicily in the year 1191, and in the year 1225 celebrations were held for the marriage of Isabella of Brienne, queen of Jerusalem, to the emperor Federico II.
Valuable paintings of several ages are collected in the chapels, sacristy and altars.
A chapel is dedicated to St.Teodoro's relics, the Saint of the city togheter with Saint Lawrence.
It's located side by side to the cathedral's bell tower, that was completed in 1795; from the other side there are the Bishop's palace and Seminary building, built in 1720 by using the materials obtained from the demolished Basilica of Saint Leucio.
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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.