Seven Wonders of the World:Great Wall of China
The Great Wall of China is a series of stone and earthen fortifications in China, built, rebuilt, and maintained between the 6th century BC and the...
Seven Natural Wonders of the World:Mount Everest
Mount Everest is the highest mountain on Earth, as measured by the height of its summit above sea level, which is 8,848 metres (29,029 ft). The m...
