Set on a rocky peninsula jutting out into the Black Sea, the ancient Bulgarian town of Old Nessebar is one of the country’s few UNESCO World Heritage Sites. Today, it is one of Bulgaria’s most popular tourist destinations, and for good reason: it’s packed with exceptionally picturesque wooden houses and churches. The small peninsula is connected to the main land via a man-made isthmus meaning “narrow strip of land connecting two areas of land” in Ancient Greek.