Hume Castle is the heavily modified remnants of a late 12th- or early 13th-century castle of enceinte held by the powerful Hume or Home family, Wardens of the Eastern March who became successively the Lords Home and the Earls of Home.
Standing as it does, on an impressive height above its eponymous castleton, it commands fine prospects across the Merse, with views to the English border at Carter Bar. It had historically been used as a beacon to warn of invasion. Its enormous walls were created in the 18th century but remnants of the central keep and other features can still be seen.
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.