"Carevi Kuli" or "Strumica Fortress" is located on the southwestern periphery of Strumica at an altitude of 445 m. and is an archeological site that has its origins in the late Eneolithic.
In Antiquity the city was known as Astraion, as written by the historian Titus Livius in 181 BC.
At the end of the XI and the beginning of the XII century, during the emperors of the Komnenian dynasty, the life of the Carevi Kuli significantly intensified. Then the first contours of the medieval fortress appear, the remains of which still stand today.
The fortress played an important role in the history of this part of Macedonia, and it had its headquarters in the garrisons of Dobromir Hrs, Strez, Protosevat Hrelja and others.
The fortress played an important role in the Serbo-Byzantine conflicts at the end of the XIII and the beginning of the XIV century, and later became part of Dushan's Serbia.
In the Ottoman period, its defense role is slowly stagnating.
The fortress is divided into two main parts: west and south. The western part is the space for the military garrison, while in the southern part are the residential buildings.
The main entrance to the fortress was on the south side. The entrance was flanked by two rectangular towers, of which the southwestern one is still preserved today, although in a damaged condition.
As for the southeast tower, it rose until the earthquake that hit these parts in the thirties of the XX century.
The entrance on the south side was organized with a bridge, which was probably movable in some periods and which bridged the artificially made deep valley connecting it with the ridge south of the entrance.
The most dominant on the fortress are the ramparts with their towers. On the west side is the gate with two towers, and in front of the entrance there was a deep trench over which the bridge that led to the fortress descended. The most preserved and interesting is the tower inside the fortress, which was probably built by the 12th century at the latest.
During the reconstruction of the Carevi Kuli, a medieval church dating from the end of the XII century and the beginning of the XIII century was discovered.
In front of the altar area of the church was found a cross with a saint and the inscription George, which indicates that this church may have been dedicated to St. George.