The Ruins of the historical complex of Izad Khast from the Sassanids to Qajars period is located in Fars province, Iran. The Castle is a unique form of construction, but can be compared with Citadel of Bam, Rhine and many other Citadels from the materials used point of view. The Complex contains one Caravansary and the Safavid-period bridge. The works inside of the Castle belongs to different periods. The most important section of the complex is the castle that has been built on Singular bedrock in a Sand construction and close to the Valley of Izad Khast.