The most important historical attraction of this old region is Rayen citadel ( Arg-e Rayen ) which is the largest adobe structure after Arg-e Bam ( Bam citadel ). Rayen citadel has more than 22000m2 area and also is the valuable and cultural monument which is visits by thousand internal and external tourists. This citadel is located in the western sough of Rayen city on high hill, that surrounded by 10 meters height wall. The only castle entry is from eastern side direction with a wonderful and big façade. The citadel includes: Market, Mosque, Sports club and public houses.
Rayen castle is one of the important monuments which shows Rayen old history and confirmed that Rayen was inhabited place before Islam and Sassanid ear. There were some older castle that have been destroyed by natural disasters, During Yazdgerd the third ear, the Arabs commander, Mejash ebn-e Masoud Salmi couldn’t enter to the Rayen castle during Kerman province triumph, because it ware very strong and fortified castle. Bahram Shah War with Malek Arsalan occurred near by the castle in 6th century EC, then the Rayen people came out of the castle and ended it in favor of Malek Arsalan.