Montornés Castle sits on Roman remains. Built in the 10th century as part of a Moorish defence system, the castle was reinforced and extended by the Christians after the Reconquista.
The castle is composed of three areas surrounded by a curtain wall and forms a triangle with Torre San Vicente and Casoleta de Salandó, two structures that served to further strengthen its defence. In the present-day, only some sections of the wall, cisterns and two watchtowers are standing. It is not known exactly how and when the fortress was destroyed, though it is known that it was inhabited until the 15th century.
There are beautiful views over the Plana (Plain) of Castellón and the Mediterranean Sea.
References:Herceg Novi was founded (on a former small fishing village, existing since Roman Empire times) as a fortress in 1382 by first Bosnian King Stjepan Tvrtko I and was called Sveti Stefan or Castelnuovo. The Turks conquered Herceg Novi in 1482, and ruled for 200 years, until 1687. However, there was a short pause between 1538 and 1539 when it was held by the Spaniards before they were defeated in the Siege of Castelnuovo. Turkey ruled again until 1687, from then until 1797, the town was ruled by the Venetian Republic.
The Herceg Novi old town is amazing. It is on a fairly steep hill that leads all the way down to the sea. Wandering through the small stairways to the various plazas and fortresses is a many hour adventure.