Bulgaria

Cathedral housing several hundred icons and murals commissioned by architect Alexander Pomerantsev to commemorate two hundred thousand soldiers who died during the Russo-Turkish War.

Open-air museum showcasing the excavated remains of an ancient Roman city, featuring paved streets, residences, and public buildings dating from the 4th to 6th centuries.

Roman stadium built in the 2nd century AD during the reign of Emperor Hadrian, once seating 30,000 spectators for athletic games and gladiator contests.

Eastern Orthodox monastery founded in 1083, featuring a blend of Byzantine, Georgian, and Bulgarian architectural styles and a collection of valuable religious icons.

Early medieval rock relief carved into a cliffside, depicting a horseman triumphing over a lion and representing a significant monument of the First Bulgarian Empire.

Late antique basilica featuring extensive, well-preserved Roman mosaics that date back to the 4th and 5th centuries, showcasing intricate geometric and avian designs.

Museum housing several thousand artifacts and three hundred separate collections, including the Valchitran Treasure and several hundred Thracian and Roman objects, situated within a religious building constructed by Grand Vizier Mahmud Pasha to serve as the primary mosque of the Ottoman administration.

Medieval cave monastery carved into a 25-meter high limestone cliff, featuring preserved 13th-century frescoes and a complex of monastic cells and chapels.

Public facility with several thermal pools and treatment rooms, where municipal residents utilized mineral water sources for several centuries, is now a museum housing thousands of artifacts related to the history of the city.

Church containing three naves and a transept constructed above a necropolis where two hundred separate tombs and four earlier Christian temples were excavated.