Castello Barbarossa is an archaeological ruin and ornithological station on the island of Capri. It derives its name from the pirate and Ottoman admiral, Hayreddin, nicknamed Barbarossa ('Redbeard'), who stormed it in 1535 and destroyed it in 1544. The construction date is uncertain but it perhaps dates back to the late ninth century. From 1898, the structure, now in ruins, was owned by the Swedish psychiatrist Axel Munthewho donated it to his foundation. The surroundings, interesting for their botanical features, are home to the island's ornithological station.
The plan of the castle is quadrangular with a semicircular wall. The ruins of the highest part, as well as forming the core of the building, belong to what was once the residential area of the castle. Indeed, there is a chapel with a vaulted apse, a belfry and a cistern that was used as a warehouse Another area, offset from the chapel, retains many features, including a vaulted roof, a small partly walled embrasure, and an arched opening. Finally, there is a room with an iron-beamed roof. Built of local stone, the fort has vaulted roofs and tiled floors. The most significant architectural features are its two towers, indicating the military function of the castle. One of them, square-shaped, was built in the Swabian period, the other, however, is circular and was built in the Angevin period.
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Trenčín Castle is relatively large renovated castle, towering on a steep limestone cliff directly above the city of Trenčín. It is a dominant feature not only of Trenčín, but also of the entire Považie region. The castle is a national monument.
History of the castle cliff dates back to the Roman Empire, what is proved by the inscription on the castle cliff proclaiming the victory of Roman legion against Germans in the year 179.
Today’s castle was probably built on the hill-fort. The first proven building on the hill was the Great Moravian rotunda from the 9th century and later there was a stone residential tower, which served to protect the Kingdom of Hungary and the western border. In the late 13th century the castle became a property of Palatine Matúš Csák, who became Mr. of Váh and Tatras.
Matúš Csák of Trenčín built a tower, still known as Matthew’s, which is a dominant determinant of the whole building.