The Great Wall of China is the largest cultural heritage of China. Its construction began in the 7th century B.C. and stopped in the 17th century, spanning over 2,000 years. It stretches across 15 provinces in northern China and covers more than 50,000 km. It is one of the oldest and most widely distributed ancient architectural remains in the world.There are more than twenty thousand marathons in China today. Great Wall Park’s marathons have been at the top for race events, for local and international runners.