The Kastel Fortress in Banja Luka is medieval but is situated on the site of previous fortifications going all the way back to Roman and even pre-Roman times. The fortress is relatively well-preserved, and is one of Banja Luka's main attractions, situated on the left bank of the Vrbas river in the very center of town.
The site has been fortified since Roman times, but the current walls and architecture were made mainly in 1490s by Ottoman reign.
Sagunto Castle is a fortress overlooking the town of Sagunto, near Valencia in Spain. The site"s history extends back over two thousand years and includes Iberian, Roman and medieval remains.
In 214 BC, Romans took Sagunto from the Carthaginians and later built a temple and water cistern on the hill. During the Islamic period, the Albacar section and much of the outer wall were constructed, and the castle was used to defend Catalonia and Valencia. El Cid occupied it from 1098 to 1102, and in 1238, Christian king Jaume I incorporated it into the Kingdom of Valencia.
Peter IV of Aragon reinforced the castle in the 14th century, and King Peter of Castile captured it in 1363. In 1562, King Philip II commissioned upgrades, dividing the castle into seven plazas. During the War of Succession in the early 18th century, it changed hands between the Archduke of Austria and King Philip V of Spain.