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When talking about the Great Wall, people will immediately think you are referring to the wall in Ming Dynasty (1368 - 1644). Actually, north to the Ming's wall in Hexi Corridor, lies a wall built in Han Dynasty (206BC - 220), which is more than 1,000 years earlier than the Ming's wall.

The wall ends at the West Lake of Dunhuang, Gansu Province, over 311 miles west to Jiayuguan Pass. In history, the Han Dynasty built many walls to consolidate the safety of the frontier region as well as exploring ways to do business with western region. Instead of piling up stones or bricks layer upon layer like other dynasties' walls, the Han's wall is built by using the local sand and weed. These two constructional materials were added by putting one on top of another. On average, every layer measures 12 to 15 centimeters (4.7 to 5.9 inches). The present remains of the wall measure from 1.6 feet tall to over 6.6 feet tall.

Many centuries later, the only remains of Han's wall are a few broken sections and several towers distorted beyond recognition standing in the lonely desert. It is like an aged man watching the surrounding changes calmly after experiencing a lot. Listen carefully as he tells us that this place of desolation was once a fierce battlefield which was soaked by soldiers' blood. The path was stepped to and fro by the busy Persian and Han's business men as well as their camels carrying silk, china, carpet and food.

The wall is dwindling day by day because of natural disasters and human destruction. If we don't save it right now, it will finally disappear together with its glorious historical memories. The rescue work is very urgent.