It is a very large medieval castle in the center of Naples. Its picturesque location and grandiose size make it one of the most important monuments of the city. It was first built in 1279 AD, as one of the main architectural monuments of the city. It was the seat of the kings of Naples, Aragon and Spain until 1815 AD. Now it is the seat of the Naples Society for the History of the Italian Homeland, where there is also in the complex the Civic Museum, which includes a chapel and museum paths on the first and second floors. At the entrance to this castle there are masterpieces of great beauty that must be seen.