The Izad Khast Castle is located in Izadkhast in the Fars Province, central Iran. The castle was built during the Sassanid Empire (224 to 651 AD)[3] and functioned as fortified walled city on the ancient Silk Road that ran through central Iran. It is the second largest adobe building in the world after Arg-e Bam.[2]

The castle is built on a high bedrock overlooking the Izadkhast valley. Inside the castle walls are many narrow alleyways and passages criss-crossing through centuries old tiny houses and buildings.[2]

The castle and surrounding Izadkhast complex has been nominated to the UNESCO World Heritage Tentative List on August 9, 2007 in the Cultural category