The Great Wall hosts one of the most famous half marathons in the world. The Great Wall, continuously built from the 3rd century BC to the 17th century AD, inherently preserves all the material and spiritual elements that carry its outstanding universal value, according to UINESCO. The complete route is about 12,500 miles. “Elements constructed in different historical periods which constitute the complicated defense system of the property, including walls, fortresses, passes and beacon towers, have been preserved to the present day.”