The Great Wall of China can be found in China. It is one of the most iconic structures in the world, stretching over 13,000 miles and built to protect Chinese states and empires from invasions. Construction began in the 7th century BC, and various dynasties, especially the Ming Dynasty, contributed significantly to its structure. The wall features watchtowers, fortresses, and various defensive mechanisms, illustrating the intricate engineering skills of ancient Chinese civilization. It attracts millions of visitors each year, making it a UNESCO World Heritage Site and a symbol of China's historical strength and cultural heritage.