Great Wall

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Great Wall

  1. 1. Great Wall Presenter: Muzhi Liu
  2. 3. Numbers <ul><li>Built, rebuilt, and maintained between the 500 BC and the 1600s. </li></ul><ul><li>world's longest human-made structure, stretching over approximately 6,400 km (4,000 miles). To make a comparison, Mississippi river is 2,320 miles long </li></ul><ul><li>largest human-made structure ever built in terms of surface area and mass. </li></ul><ul><li>7.8 meters (25.6 ft) high and 5 meters (16.4 ft) wide. </li></ul>
  3. 5. Interesting Facts <ul><li>Original use is mainly to protect excessively long border from northern invasion. </li></ul><ul><li>Many believed it is the only human work can be seen from the moon. It hasn’t been proved yet. Later American Astronaut William Pogue proved said that &quot;it wasn't visible to the unaided eye (from space).&quot; </li></ul>

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