The ruins belong to an ancient city of the late Sassanid era (224 – 651 AD) and is believed to be built on remnants of the Elamite capital, Madaktu.

Historic texts and also recent findings reveal the fact that the city included about 5,000 houses with some modern aspects such as a water distribution system through clay pipes and underground sewers.

Furthermore, foreign experts call the unearthed city as the second and lost capital of the Soloukis, while some Iranian archeologists believe the monuments are part of the state of Shirvan.

Some resources and texts link Dareh-Shahr to Mehr Jaan Ghazagh, Saabzaan, Seymareh, or the city of Khosrow Parviz in the late Sassanid period, which was completely flattened by earthquakes in 248 and 344 AH (circa 862 and 955 AD respectively).

Located in the south of Dareh-Shahr, at the beginning of a gorge of the same name on the outskirts of Kabir Kuh, is an ancient bridge called Gavmishan with 3 arches that were repaired in 2008.

[2] Archeological excavations of the 1990s in Dareh-Shahr revealed a significant number of stucco surfaces and pieces which, in terms of diversity, finesse and aesthetics, are unique and unparalleled.

Unearthed remains of a city structure, including residential quarters, passages, stables, market place, public bath and modern sewage system, have attracted the attention of Iranian and foreign archeologists in recent years.