The Great Wall is the longest wall in the world, and it has a history of more than 2,000 years. It is one of the seven wonders in the world.
It is over 6,000 kilometres long, 6 to 7 metres high and 4 to 5 metres wide. It is wide enough for seven horses to walk side by side. Now the Great Wall has become a place of interest. Visitors from all parts of the world come to visit the Great Wall every day.