Hisarya is located about 40km from the city of Plovdiv. The oldest remains that have been found in the city date from the 4th century BC. It was founded by the emperor Diocletian who also gave the name of the city, at that time called, Dioclecianopolis. To protect against enemy attacks, Diocletian ordered that the city be surrounded by high walls, whose circumference is 2327 m and in certain places reached 13 meters in height.At that time, to enter the city, four doors were used, one of which, the main and largest, is called Camels and today is one of the symbols of the city. The walls of the then Diocletianopolis are among the best preserved in Europe.

Another surprising thing is that there are Roman baths extremely well preserved that at that time were used for thermal procedures. They are preserved almost to the ceiling and impress tourists with their originality. The first thermal procedures in Bulgaria were carried out in the distant 1882 and do you know where? Right in the city of Hisarya. The city has 22 points with mineral water with different physical-chemical composition and temperature which has proven curative qualities.