Inside the fortress there were palaces, temples, service and utility rooms, including a treasury. The square building of the treasury had blank walls and a flat roof. Probably, in the last years of the existence of the Parthian state, the treasury was damaged by an earthquake, perhaps it was robbed. But even what archaeologists have found suggests what great values were stored in it. Details of Parthian weapons and precious horse harness, various vessels, both locally made and Egyptian and Syrian, fragments of jewelry made of glass, mastic, bone, shells, gems and precious metals, coins of Alexander the Great, Seleucids, Arsacids and kings were found. Greco-Bactrian kingdom. Some of the coins were counterfeit. Therefore, vigilant Parthian treasurers tested them by cutting them on the side or cutting them in half.
Numerous and well-preserved works of art were found: sculptures made of bone, metal, stone, part of the ceremonial throne of the Ar-Shakid kings and a large number of rhytons - horn-shaped ivory vessels decorated with carvings, paintings, and sculptural details. Perhaps these precious vessels were used during solemn ceremonies or palace feasts.
It is known that among the Parthians there was a widespread custom to drink an intoxicating drink, "giving comprehensive knowledge." During this ceremony, they discussed especially important matters.
One of the Nysian rhytons is decorated with a relief image, the plot of which can be associated with the legend of the Theban king Pentheus. The curious king secretly entered the festival dedicated to the god of wine, Dionysus. Among the participants in the sacred rites in honor of Dionysus - the Bacchantes - was the mother of Pen-they, Queen Agave. Intoxicated with wine, the Bacchantes mistook the king for a sacrificial animal and tore it to pieces, sacrificing it to their god. This Greek legend was the basis of Euripides' drama "The Bacchae", known at the Arsacid court. It was once played by actors in the presence of Tsar Orod, the winner of the Romans at Carrhae. At the climax of the performance, a crowd of actors portraying Bacchantes brought onto the stage on raised thyrsus rods not the rag head of the mythical Penfey, but the head of the defeated Roman commander Crassus and threw it at the feet of the Parthian king to the enthusiastic cries of those present.