Only 3km from southern end of Sunny Beach is the ancient town of Nessebar.

Nessebar is located on a small peninsula in the Black Sea which is linked with the land only by a long and narrow isthmus. It is one of the oldest towns in the world and has existed for more than 9,000 years.

The town is separated into two halves the Old Town and the New Town. The old part of the town has regained its original romantic atmosphere: narrow cobblestone lanes, tiny squares, two-storeyed period houses with stone-built ground levels and wooden upper floors jutting above the streets and external staircases, gift shops, pubs, tavern and lovely flower gardens. The largest number and best known buildings date from 11th to 14th centuries almost all of them churches in the so called "picturesque" style: walls intersected by pilasters and lunettes, with stone, brick and ceramic ornaments and arches along the cornice. Christ Pantokrator church (10th - 11th c.) Some of the churches have stunningly beautiful facades and interiors and are among the best preserved ones in the Balkan Peninsula. The oldest one is the Sveti Ioan Krastitel (St.John the Baptist, 10th -11th century.

The division between the New Town and Old Town is marked with a Windmill.