Bastione di Saint Remy is a monumental defensive structure located in the historic center of Cagliari, Sardinia, Italy. It was built in the second half of the 19th century on the top of a hill overlooking the city and the Gulf of Cagliari.

The bastion was designed by the architect Filippo Figari and named after King Charles Felix of Savoy, whose dynasty had ruled over Sardinia at the time. Its construction aimed to modernize the fortifications of the city and to provide a panoramic viewpoint for visitors.

The bastion has a pentagonal shape with four corner towers and a central terrace surrounded by a balustrade. The terrace offers a stunning view of the city, the sea, and the mountains in the distance. There are also several cannons and military decorations on display.

Today, Bastione di Saint Remy is a popular tourist attraction and a venue for cultural events such as concerts, exhibitions, and festivals. The bastion can be reached by a long staircase from the street level or by a lift that connects the upper and lower parts of the city. At the base of the bastion, there is a large square called Piazza Costituzione, which serves as a meeting point for locals and tourists alike.