Kyrk-Kyz Kala fortress (I-VIth centuries AD) is in 27 km to the north from the city of Biruni. It is located beyond the city and approximately was the country residence of governors. The name of a fortress means «forty girls». According to one legend, in this fortress lived a courageous queen Gulyaim with forty companions. These brave women beat off from terrible enemies.
This site of ancient settlement found in 1938 at carrying out archeological excavations. The sizes of the fortress of 65х 63 m 65, it was located on the flat district. The external wall possessed two circles with arrow-shaped loopholes. According to researchers, the fortress was erected to protect northeast borders of ancient Khoresm. Archeologists found the burials made on a ceremony of ancient fire-worshippers in a site of ancient settlement. Bones of the person were laid in ceramic jugs – huma, the heads of the woman having a form. This fortress was those times a trading place of the Great Silk Road.
Kyrk-Kyz was built from a mud brick with the addition of adobe, whereas arch overlappings were created from a baked brick. According to carried out archeological excavations, it is supposed that the fortress was divided into four parts. In the north-western and in the northeast part were 5 rooms which were combined only with a corridor. The southwestern part also included five rooms; however, there were only two corridors. The southeastern part consisted of two rooms and one corridor. In other parts of the residence, there was a reception where dervishes prayed. The interior of the residence did not stand out with the abundant decor. A refinement of the internal garment is distinguished by different forms and techniques of a window and arch apertures bricklaying.