Castello Aragonese is a fortification in Taranto. Officially called the Castel San Angelo, it was built on the site of older fortifications dating to Greek occupation in the third and fourth centuries BC. In 1481 the low ground in front of the fortification site was excavated to allow the passage of boats, and to create a moated defensive position. The present fortress was built for the then-king of Naples, Ferdinand II of Aragon in 1496 to reinforce the naturally low-lying link between the old town of Taranto on a peninsula, and the mainland. The seven-towered design is attributed to Francesco di Giorgio Martini of Siena.
The fortress repelled an Ottoman attack in 1594, but it quickly lost its military significance with the advent of artillery. It was converted to an artillery platform and many interior spaces were filled in to provide a stable base for the guns. In 1707 under the Habsburgs it was converted to a prison however during the Napoleonic period it reverted to its original function as a military fortress. French generals Thomas-Alexandre Dumas and Jean-Baptiste Felix de Manscourt du Rozoy were the most illustrious prisoners of the castle having been taken prisoner in 1799 by the pro-Bourbon Sanfedismi when their damaged ship sought refuge at Taranto Harbour. At the time, Taranto was part of the Kingdom of Naples.
In 1883 the San Angelo tower was demolished to allow construction of the Ponte Girevole, and two others were removed to allow the widening of the canal. Since 1883 the fort has been occupied by the Italian Navy. Beginning in 2003 the Navy began restoration and archeological work on the site, removing plasterwork and investigating fortification work dating back to the Byzantine era. The fort is open for tours.
References:Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.