Todolella Castle was built in the 14th century and later rebuilt as a residence in the 16th century. It comprises four structures, sitting around a central patio, where there are different types of rooms.
The mason-built walls of Todolella Castle are topped with merlons, thanks to a recent restoration project. The castle is currently a private property and inhabited, but you can come for a visit when you book in advance.
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.