Ctesiphon is about 30 km southeast of Baghdad, now known as Al-Madaen or Salman Pak. Ctesiphon was the capital of the Persian Sassanids The Arabs were able to overthrow the Sasanian Empire in 651, and after that they established the city of Al-Madaen, which consisted of two cities: Seleucia on the western bank of the Tigris River, and the city of Ctesiphon on the eastern bank of the river. The most prominent landmarks of the city of Ctesiphon Taq Kisra: The arch is the oldest and largest free-standing arch in the world. Taq Khosrow represents one of the symbols of urban progress in those times, and is considered an important part of one of the palaces built by the Sasanian kings. Mosque and shrine of Salman Al-Farsi: He is one of the companions of Muhammad, the Prophet of Islam. He is Abu Abdullah Salman Al-Farsi, and he is from Persia. The mosque consists of three buildings, the main building that houses the remains of Salman al-Farisi, a building that houses the remains of Hudhayfa bin al-Yaman, and a building that houses the remains of the companion Jaber bin Abdullah al-Ansari and the remains of Taher bin Imam Muhammad Baqir, one of the descendants of Muhammad, the Prophet of Islam.One of the main tourist attractions in Iraq, as it is surrounded by orchards and the Tigris River and increases the number of visitors in the spring. But over the past two decades, it has suffered from neglect.