Dargan-Ata is a medieval fortress with a two-part layout typical of the fortifications in Khwarazm, making it the southernmost city in this historical region. The northern and western walls of the fortress overlook the Amu Darya River and follow the contour of the natural cliffs that rise above the river's floodplain. From the south and east, the fortress has rectangular outlines and is surrounded by a wide moat. The total area of the fortress reached 8 hectares. Along the outer walls, there were more than 20 rectangular and circular towers. In the 10th century, it was considered the second most important city in Khwarazm after Gurganj. In the 11th century, Dargan was mentioned as an intermediate point on the caravan route from Amul to Gurganj. It was during this time that the fortress walls were constructed. In the 1360s, when Dargan was part of the possessions of the Sufi dynasty, the mausoleum of Dargan-Ata was built on its territory, which is the only surviving building in the fortress. The name of this monument is associated with later folklore traditions. However, an Arabic inscription naming a military commander, Mizrab Padit, is preserved inside the mausoleum. Nevertheless, the current local tradition associates the mausoleum with the name of Abu Muslim, an Arab religious and political figure who died in Merv. The mausoleum is a two-chamber building made of fired bricks with a developed pesh-tak (an entrance portal), devoid of any decorative elements, and follows the traditions of the Khwarazm architectural school.