ocr: Great Wal, China About the Great Wall The reat Wall of China is the largest building project ever carried out and the only man-made structure that can be seen from space. The 30-foot-high (91 m) wall with its fortified watchtowers runs 1,5UU miles (2,400 km) east to west from the Yellow Sea to central Asia. In214 B.C.E.Emperor Shih Huang-ti strengthened already existing GREAT WALL walls and connected them to form a: single detensive system. Extended over the centuries, - it became famous as the Great Wall.
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