Echoes of glorious ages past still linger in the region of Yambol thanks to its greatest glory - the National Archaeological Reserve "Kabyle", near the modern village of Kabile. The ancient city was established around 2000 BC on the Zaychi Vrah Heights, around the Thracian rock sanctuary.

It is assumed that the settlement bears the name of the Thracian goddess Kibela or Cybele, known as the Great Mother of the Gods, whose image can be seen near the sanctuary.

By the end of the 2nd millennium BC, Kabyle had already developed into a major economic and cultural center, but served as a prestigious place of worship as well. Not only that but it became the royal residence of the Thracian Kings of Spartok and Skostok, and had its own mint. Within the Roman Empire it was a major trade center and military camp, having a very prime location near the road of Aynos (modern-day Enez).

Kabyle’s church is considered the largest basilica in the whole country in terms of area. Archaeological excavations in Kabyle have revealed and examined 15 different edifices and structures, including Thracian fortress walls, defensive towers, Roman baths, military barracks, early Christian churches, even a whole neighborhood of late antique Kabyle, and others. Some of them are open to visitors.

Among the hundreds of artifacts on display at the museum close to the reserve, visitors of the Kabyle Reserve can enjoy exquisite ornaments, jewelry, household and culinary tools and equipment, containers, amphorae and many others.

The various reenactments recreating scenes from everyday life, cult practices, military exercises and weapon demonstrations provide insight into the life of the city during the 2^nd c. BC.