the Great wall of China

The Great Wall of China is a series of fortifications built along the northern borders of China to protect against invasions from the north. The wall was built over several centuries, with construction beginning in the 7th century BC and continuing until the 17th century AD. The wall stretches over 13,000 miles (21,000 km) and is made of a variety of materials, including brick, tamped earth, stone, and wood.

The Great Wall is one of the most impressive structures ever built by human hands, and is considered one of the Seven Wonders of the World. It is a symbol of Chinese engineering and military prowess, and has become a popular tourist attraction. The wall is divided into several sections, with some sections being more well-preserved than others. Some of the most popular sections to visit include the Badaling, Mutianyu, and Jiankou sections