The castle served as the final refuge for Pope Pius IX in 1848 during his exile from the Roman Republic.
It was used as a military prison for high-ranking political figures until 1980.
The structure is divided into the 'Castello Inferiore' (Angevin) and the 'Castello Superiore' (Aragonese).
The prison cells historically housed Giuseppe Mazzini and various prominent brigands of the post-unification era.
It sits atop Monte Circeo's southern counterpart, the Colle di San Francesco.
The masonry incorporates repurposed Roman materials salvaged from earlier structures in the Gaeta region.
The Castello Angioino-Aragonese is a massive fortification complex overlooking the Gulf of Gaeta, consisting of two distinct buildings: the Angevin castle and the subsequent Aragonese construction. It occupies the site of a 6th-century fortress, significantly expanded by Charles II of Anjou in the late 13th century. Emperor Charles V later integrated these structures into a larger defensive system in the 16th century. For centuries, the castle served as a strategic military outpost and a royal residence for various rulers of Southern Italy. It functioned as a high-security military prison for the Italian state until the late 20th century. The complex is now partially repurposed for cultural exhibitions and state ceremonies. Its architecture reflects layers of medieval, Renaissance, and modern fortification techniques. It remains one of the most prominent landmarks on the Tyrrhenian coast of Lazio.
The panoramic terrace facing the Gulf of Gaeta, which offers a clear view of the harbor and the Serapo coastline.
Wear sturdy walking shoes as the approach involves steep, uneven inclines.
Check local municipal announcements before visiting, as sections may be closed due to official government functions.
Combine your visit with the nearby Tempio di San Francesco for a comprehensive view of the city's hilltop defenses.
Do not expect full access to every wing, as parts of the facility remain restricted or under intermittent military management.
Access is frequently restricted; verify current public visitation status via the Gaeta municipal tourism office as it often closes for maintenance or state use.
Respect all cordoned-off military or government zones; modest attire is expected if visiting attached religious areas.
