This hilltop basilica is one of several remarkable buildings atop the Capitoline Hill, which is littered with Roman ruins, evidence of the city's long history as an important port. In fact, the cathedral's squat, 14th-century campanile rises from the ruins of a 1st-century-A.D. Roman temple. Pleasingly asymmetrical, the cathedral is dedicated to Saint Just, Trieste's patron. It incorporates two 5th-century Romanesque basilicas, one already dedicated to San Giusto, the other to Santa Maria Assunta. You'll see what remains of both as you step inside: The two right aisles belong to the original San Giusto, the two left aisles to Santa Maria Assunta, and in the center is the 14th-century nave that was added to bring them together. The apse mosaics at the ends of the aisles are from the 13th century; those in the main apse date from 1932.