The town of Hisarya is situated in Central Bulgaria, 40 km north of Plovdiv and approximately 180 km east of Sofia. Hisarya is famous for its healing mineral waters: 16 natural mineral springs and 6 drilled mineral water wells. The town is one of the oldest and most popular balneological and spa centres in Bulgaria. The climate is mild and pleasant, and one remarkable phenomenon there is the lack of fog. Because of this fact the town is regarded one of the sunniest spots in Bulgaria. The average temperature in July is 21.4 degrees С and the average temperature in January is 1.1°С. The minimum temperatures in January are -10/-11°С.

The pleasant climate and the mineral waters of this location have proven to be attractive to settlers since ancient times. A prehistoric settlement existed in this place way back in the 5th century BC. A Thracian settlement from the 4th - 3rd centuries BC was also established in the region. The settlement's heyday was during the Roman era. In 293 Emperor Diocletian declared it a town and this marked the beginning of the construction of massive fortification walls, public buildings, baths, streets, etc. It became the third biggest town in Thracia Province. In terms of state of preservation and uniqueness of its fortification system, the Roman town of Diocletianopolis is among the top-ranked in Europe. The fortification wall is 2327 m long and up to 11 m high in certain sections. The southern gate also known as the Camels stands 13 m tall. The urban architecture of the ancient town is mainly situated in Hisarya's Momina salza Park (Maiden's Tear Park). There visitors will find a large and impressive public building (residence), thermal springs stretching over an area of around 2000 sq m, and an amphitheatre. 300 m south of the fortified town lies a Roman family tomb. It has been preserved in its original form and is open for visitors. A multicoloured floor mosaic and rose wall-paintings can be found there.

The town located on the territory of the ancient fortress and the monuments of culture /fortified wall, amphitheatre, public buildings, Christian basilicas, barracks, villas, thermal springs, and a Roman tomb/ comprise Diocletianopolis National Archaeological Reserve.

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