Khorremabad (Persian خرم‌آباد‎) is a city in western Iran, the administrative center of Lorestan Ostan. The population is 328,544 people. Khorremabad is located in the Zagros Mountains. The city is inhabited mainly by Lurs. Important agricultural center.

History
Khorremabad is one of the first human habitats in Iran. The reports and research results of Dr. Frank Hu, a professor at Rice University, and his colleagues show that work was carried out in the Khorremabad Valley more than 40-50 thousand years ago.
In 1967, a work on the prehistoric period of Khorramabad was published in the United States, which tells about the life of people in the southwestern regions of Iran. Caves about 10 kilometers long were found in the mountains at an altitude of 1170 meters above sea level.
Many researchers believe that the Elamites (3200-2700 BC) were the founders of Khorremabad.
In the XIV century the city was completely destroyed. Only the tower remained, which was a source of water, so they began to build houses here, which in the future formed the city. During the Safavid dynasty (1502-1736), the city flourished and was one of the important centers of Iran.

Sights
In the center of the city of Khorremabad is the colorful Kiyo Lake. In addition, it should be noted the ancient city of Shapur-khast, the Shapuri bridge, the medieval fortress of Falak al-Aflak, the brick minaret and the inscription “Gerdab sangi” (Stone Whirlpool), the Nozhiyan waterfall, the Great triple waterfall, the Cathedral Mosque, the Shabihun gorge, the cave and Soul park. Khorramabad has been selected as a model tourism city by the United Nations Human Settlements Program Regional Office due to the implementation of a sustainable urban development project based on tourism. The city of Shapur-hast is one of the oldest monuments of Khorramabad. Shapur-hast was built, probably by order of the Sasanian Shah Shapur I in the 3rd century BC. AD, and its ruins have been preserved in various places on the southern outskirts of modern Khorramabad. Among the surviving monuments of it, one should point out the inscription and the Shapuri bridge, whose ruins on the outskirts of the city testify to the glorious history of this city.

The ruins of a giant and wide wall, built in the architectural style of the Sassanid era, remained from this city. One of the masterpieces of architecture of the Sassanid era is rightfully called the “Broken Bridge” or the “Shapuri” bridge, which located on the south side of the fortress of Falak al-Aflaq. The Shapuri bridge connected the western part of the province of Luristan (Tarkhan region) with the east, and from there with the province of Khuzistan and Ctesiphon, the capital of the Sassanids. This bridge, of which only ruins remain, is located in the southwest of Khorramabad. At one time it was considered a masterpiece of architecture. The fortress of Falak al-Aflaq is considered the most famous and interesting historical monument of Khorramabad. This fortress, known as the “Fortress with Twelve Towers”, was built in the 13th century. Falak al-Aflaq, with an area of ​​approximately 230 square meters, rises 23 meters above the height of the hill. In the inner space of the fortress there are two large courtyards, and around – numerous rooms with windows that overlook the outer sides. Under the hill where the fortress was built, there is a large spring with pleasant-tasting drinking water, known as Golestan (from Persian gol – rose, and stan – country). To the east of the fortress, a river flows through the city, creating an amazing landscape, including due to the nearby gardens.