Bokenäs Old Church is one of the most well-preserved medieval churches in Bohuslän. It was founded at some point in the early 12th century, and has been in use since. Except for parts of the interior, the weapon house from the 17th century, and the tower from 1752, most of the church is original. The church is open to the public daily during the summer, and for pre-arranged visits during the rest of the year, due to maintenance costs.
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.