San Giusto Castle and Cathedral

San Giusto hill is where Trieste began and where it is still easiest to read its history. The hill was the site of the earliest fortified settlement, the predecessor of the Roman town of Tergeste, and the top of it now holds both the castle and the cathedral side by side. The castle took its present form in the late fifteenth century, when the Habsburg ruler ordered a fortress with a tower to house the Imperial Captain, and was extended with massive bastions in the following century and a half. Because it never saw serious fighting, the walls survive intact and the ramparts can be walked all the way round. The castle houses a civic museum in the Captain's House, with a Late Gothic chapel, a collection of arms from the twelfth to the nineteenth century, and a stone gallery of Roman inscriptions and sculptures set in one of the bastions. Temporary exhibitions use another bastion. The terraces and ramparts give the real reward: a wide view over the old town, the port, the Karst plateau behind and the gulf in front, which is easier to enjoy here than from any building in the centre. Next door, the cathedral combines two earlier churches into one unusual interior, with medieval mosaics and a rich collection of old stones.

A visit works best as a short climb and a slow loop. From the cathedral square, follow the walkway into the castle courtyard, walk the ramparts clockwise, and spend the longest time at the terrace on the sea side. The museum is compact enough to see in about an hour, and the Roman stones in the bastion help make sense of the ruins you will see lower down in the old town.

The original bronze figures from the town hall clock, Mikez and Jakez, stand near the entrance, which is a nice way to link the hill to the square below.

The cathedral deserves a separate stop. San Giusto was formed in the fourteenth century by joining two older churches beside a Romanesque bell tower, and the plan still shows it: a double nave with different styles side by side. Inside, golden mosaics in the apse glow at certain times of day, and the shrine of the patron saint is the focus of the city's main religious festival. The surrounding lawns and the small archaeological spots nearby make this a calm corner, even in the busy season.

Getting to the hill is half the fun. The walk up from the Roman theatre or from the old town streets is steep but short, with plenty of steps, and city buses and taxis serve the area if you prefer. Mobility access is possible by road to the upper level, but check the current arrangements before relying on it.

Allow two hours for the castle, the cathedral and the views. Bring a layer, because the exposed ramparts can be windy, and check seasonal opening hours and ticket arrangements before you go, as the museum follows civic museum timetables with a weekly closing day in some seasons.

A little preparation improves the visit. Wear shoes with grip, because the paving on the ramparts and the approach lanes can be slippery after rain. Bring water in summer, as shade on the walls is limited, and a layer in winter, when the wind across the hill is sharp. If you are interested in Roman history, ask at the museum about the stone inscriptions and sculptures gallery, which gives context to the theatre below. Families can turn the visit into a game by counting towers and bastions as you circle the walls.