That is actually a tricky question, because Assyria had several capitals over time. In the Old Assyrian Empire, it was Assur, from which the country had its name. In the New Empire, it was Nineveh, although for a while, the kings resided in Khorsabad. Nineveh was destroyed in 612 BCE, and afterwards, Nisibis and Assur were the most important cities of the region. The next reference point we have is really the short-lived Roman province of Assyria that existed between 115 and 117 CE, and was the name given by the Romans to the country of Adiabene. The capital of Adiabene was Arbela, modern-day Erbil, a town you might know from an Iron Maiden song. Erbil is now the capital of Iraqi Kurdistan. So I would say that the correct answer in the movie would have been Arbela.