The Great Wall of China began construction during the 7th century BCE, with significant expansions and modifications made over the centuries. The most well-known sections of the wall were built during the Ming Dynasty from the 14th to the 17th century CE. Originally constructed to protect the Chinese states from invasions by nomadic tribes, the wall showcases remarkable engineering and architectural skills. It served multiple purposes over the centuries, including border control, trade regulation, and the imposition of duties on goods transported along the Silk Road. The Great Wall now stands as a symbol of China's historical significance.