The construction of the Great Wall of China began as early as the 7th century BCE, but the most significant and well-known construction took place during the Ming Dynasty (1368-1644 CE). The Ming Dynasty rulers undertook extensive efforts to fortify and expand the existing walls, resulting in the construction of the iconic sections that are most recognized today. While some portions of the wall predate the Ming Dynasty, the majority of the well-preserved sections that are visited by tourists were built during this period. The construction of the Great Wall of China continued intermittently over many centuries, with various dynasties contributing to its expansion and maintenance.