Lost city, a real-life 'Helm's Deep,' possibly discovered in Iraq

The stronghold, known as Rabana-Merquly, was once part of the Parthian Empire (also known as the Arsacid Empire), which reigned(opens in new tab) between 247 B.C. and A.D. 224. The Parthians were bitter enemies of the Roman Empire, and fought various battles against them for over 250 years(opens in new tab). Now, new research at this 2,000-year-old fortress suggests that it served as one of the empire's regional centers.