Pyramid at Chichen Itza - Mexico The Great Wall - China Petra - Jordan Christ Redeemer Statue - Brazil Machu Picchu - Peru Roman Colosseum - Italy Taj Mahal - India

 

The Great Wall - China This 4,160-mile wall was built to protect China from invading Huns, Mongols, and other tribes, and to unite fortifications into one defense system. Begun in the 7th century B.C., the barricade took hundreds of years to build, and ranks as the world's longest man-made structure-and is apparently the only one visible from space. This Great Wall of China was built to link existing fortifications into a united defense system and better keep invading Mongol tribes out of China. It is the largest man-made monument ever to have been built and it is disputed that it is the only one visible from space. Many thousands of people must have given their lives to build this colossal construction.