Founded in early medieval times, probably in the XIth century, the Castle of Gorizia remains a robust and articulate construction to this day with its distinctive shape of a pentagon around the wide Court of the Lanzi. From the Court visitors access the 13th century Palazzetto of the Counts, the western part of the Castle - recognized from its five Romanesque windows, and the 15th century Palace of the Provincial States in the east, connected to the Palazzetto by means of a connecting structure called Palazzetto Veneto. The rooms in the Castle are furnished with ancient furniture: on the ground floor one can admire the small dining room and the kitchen, with medieval furniture and implements. Also on the ground floor is the Hall of the Knights, where there are some interesting copies of arms and armor.

Near Piazza Cavour the Court of Saint Ilario opens out, dominated by the imposing bulk of the Cathedral, a church devoted to Saint Ilario and Saint Taziano.

The only surviving parts of an old convent founded by the Sainted Abbot: It originated from a fourteenth-century guesthouse built by the Counts of Gorizia and that is connected to the castle by an underground passage.

Returning to Piazza Cavour and turning into Via del Rastello we come to Piazza della Vittoria dominated by the fairytale Fountain of Neptune, designed by Nicolò Pacassi.

The Jewish Ghetto and the Synagogue lies on Ascoli Street. An imposing 19th century building with sober features that contains the very interesting didactic Museum of the “Little Jerusalem on the Isonzo” (according to the name defining the local Hebrew community).