The Gorgan Wall, also known as Iran’s “Great Wall” or the Red Snake, is one of the most remarkable yet lesser-known defensive structures of the ancient world. Stretching for about 195 kilometers (121 miles) in northeastern Iran, it was constructed during the Sasanian Empire between the 5th and 6th centuries CE, though some sections may date back to the Parthian era. The wall served a strategic purpose, protecting the empire from northern nomadic tribes, much like the Great Wall of China did for