China is known for the Great Wall, which is one of the most iconic structures in the world. The wall, built over several dynasties starting in the 7th century BC, was primarily constructed for defense against invasions and raids from nomadic groups from the north. Stretching over 13,000 miles, the Great Wall symbolizes Chinese engineering and historical perseverance. It attracts millions of tourists globally each year who seek to explore its vast length and learn about the rich history associated with it, making it a UNESCO World Heritage site.