Having a city with the same name in the center, Darreh Shahr county is located in the east of Ilam and is one of the most historical cities of Ilam. There are many historical monuments in this city indicating the long history of human life there. Darreh Shahr city includes three counties and six rural districts. People speak in Lori and Kurdi dialects. The significant point about the population density in this city is that the villagers constitute a higher percentage of the population than the townspeople. The climate of Darrhe Shahr is tropical temperate.
Based upon the historical documents, Darreh Shahr is the place of the ancient city of Madakto, the capital of Elam dynasty. This region collapsed after the Ashur conquest and it remained to decline until the time of Sassanid empire when the prosperity returned to the region. The city was called Simareh at that time. The remains of this historic city, with approximately 1400years history, are now located in the east of Darreh Shahr. The ancient city of Simareh was inscribed on the list of national heritage of Iran in 1310 S.H, as one of the first historical heritages. Some believes that a horrible earthquake destroyed the city. Chahar Taqi or fire temple of Darreh Shahr is another historical monument of Darreh Shahr; its history backs to Sassanid period.
Tang-e Bahram-e Choobin is the other tourism attraction of Darreh Shahr city. Based on the narratives, Bahram, one of the Sassanid commanders, was usually hunting in this area. Some other believe that this place had been the hideaway of Bahram. Tang-e Bahram-e Choobin is placed in a good-weather and green area. Several walls were built on the rocks of this Tang in order to increase the security and the traces of stairs are still remained. Four Ab Anbars also exist here. Unfortunately, most of the other historical monuments in this region were ruined over time.
In addition, interesting among the natural attractions of Darreh Shahr are Darband and Marbera waterfalls.
Weaving carpet, kilim and Jajim are of the handicrafts of Darreh Shahr people. Embossed-flower kilim is the main handicraft of the region. Among the local souvenirs of this region the animal oil and local butter, mountain honey, Bezhi Barsaq cookies, Kale Konji and Kaak can be mentioned.