Falak-ol-Aflak Castle or Shapur Khast Fortress is a historical fort in the city center of Khorramabad in Lorestan province. Falak-ol-Aflak is also known as the Twelve Towers Castle. It is located in the center of the city on the top of the hills overlooking the city of Khorramabad and near the river, and is the most impressive historical and tourist destination within the city.
The castle dates back to the Sassanian era. The Sassanid built a town called Shapur Khast around the current region of Khorramabad, which was later destroyed and in the 15th century, the current Khorramabad was built instead of it. It is believed that the Falak-ol-Aflak is the same fortress of Shapour. Since the 15th century, after the city of Khorramabad was built, the castle was also known as Khoramabad, and it is probably referred to as the ” Falak-ol-Aflak ” in the Qajar era.
The construction of a building, on top of a rocky cliffs and its complete dominance on the historical valley of Khorramabad, as well as the flow of Golestan spring from the northern slope of the hill are considered as the main features.
The current architecture of the building represents the many additions that have been added in different era, most of which are from the Safavid to the Qajar period. According to the visual evidence, about a hundred years ago, there were a rampart with twelve tower in the vicinity of the current building, which now, the remaining of that is visible on the northwest of the castle.
The approximate area of the building is 5300 square meters, including 8 towers and 300 turrets. The height of the tallest wall from the surface of the hill is 23 meters and its materials are from stone bricks, adobe and mortar plaster and lime.