The ca. 3th-century Persian monument Taq Kasra, or Arch of Ctesiphon, is the world’s largest brick vault. The site is the most famous architectural site of Persian Empire during Sassanian dynasty (224 to 651 AD). Taq Kasra was gradually neglected after the Arab invasion of Persia (Iran) in the 7th-century AD.
The arch ruins is now located outside Persia, close to the Iraqi capital Baghdad. It is not easy to visit the monument because of the strict security measures around its location. Taq Kasra is now located right beside the little town Salman Pak. This name was taken from the name of the Salman the Persian. He was a companian of the Islam’s prophet Mohammed and the first Persian who converted to Islam. Salman (born as Rouzbeh) was the governor of the area after the Arab conquest. He is buried there too.
At the moment the arch is under the protection of Iraqi forces. Iraq has not started to register Taq Kasra as a UNESCO World Heritage Site. However in the recent years the Iraqi Ministry of Culture has invited the Czech firm AVERS to restore the site.
Various objects have been discovered around Taq Kasra/Ctesiphon area, mostly in the late 1920s and early 1930s. The artefacts are now mostly kept at the National Museum of Berlin (Pergamonmuseum) and Metropolitan Art Museum in New York.