Sasanian - Tāq Kasrā
Tāq Kasrā, also transcribed as Taq-i Kisra, and Ayvān-e Kasrā; meaning Iwan of Khosrow are names given to the remains of a ca. 3rd-6th century Sasanian Persian monument, which is sometimes called the Archway of Ctesiphon. The arched iwan hall, open on the facade side, was about 37 meters high 26 meters across and 50 meters long, the largest man-made, free-standing vault constructed until modern times. The top of the arch is about 1 meter thick while the walls at the base are up to 7 meters thick.[6] It is the largest vault ever constructed in the world.
This palace was looted in the 7th century by the Arab invasion of Iran, after that invasion, Muslims changed the palace to the mosque on that era and after a while, it was abandoned, but throughout history, the beauty of this building attracted historians and tourists.
Carpet (Rug)
The Baharestan carpet or Bahar-e-Kasra (the spring of Khosro) also known as Fars-e-zemestani (winter carpet) and Baharestan (spring garden) was late Sasanian royal carpet, it most likely covered the floor of the great audience hall of Taq Kasra and Iwan in the Sasanian capital of Ctesiphon.
The carpet was 450 feet(140 m) long and 90 feet (27m) wide. the carpet was Woven of silk, gold, silver, and rare stones. The carpet depicted a splendid garden akin to paradise. When the city fell to Arabs in 637, the carpet was too heavy for Iranians to carry away, and which has resulted in the carpet being seized by the Arabs.