The Great Wall of China can be found in China. This extensive series of fortifications, built over several dynasties, stretches across northern China and was primarily constructed to protect against invasions and raids. The wall spans thousands of miles and features various materials, including stone, brick, tamped earth, and wood, depending on the local resources available. Its construction began as early as the 7th century BC, with major sections built during the Ming Dynasty (14th-17th centuries). Today, the Great Wall is not only a UNESCO World Heritage Site but also one of the world's most iconic landmarks.