Taq Kasra is a unique landmark in the history of architecture, as it is the largest single-span vault in the world that was made of freestanding unenforced brickwork, representing a mysterious ancient ingenuity. The Arch was part of the royal palace complex in the ancient city of Ctesiphon, the main capital of Persia from the 2nd century BC to the 7th century AD.

The architectural model was built based on available documents and various historical sources in real scale and in its complete form.

Today, Ctesiphon doesn’t exist, and the Arch is the only surviving structure from the palace and the city. It was used by Parthian Empire succeeded by Sassanid Empire and offered proximity to the Roman Empire.

The Arch was about 37 meters high, 26 meters across, and 50 meters long. It is located in today’s Iraq. Its cracked structures are gradually falling, and the latest collapse happened in 2020.