St. Mary's Cathedral stands in Danziger Straße and was built between 1890 and 1893 to the designs of Arnold Güldenpfennig. The church was erected in Romanesque revival style at the instigation of Bishop Bernhard Höting of Osnabrück, then simultaneously officiating as Vicar Apostolic of the Vicariate Apostolic of the Nordic Missions of Germany, then competent for Hamburg's Catholics. It was the first new Roman Catholic church built in Hamburg since the Reformation.
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.