Great Wall of China the optics much better, rendering photographic evidence irrelevant to the issue of whether it is visible to the naked eye. Great Wall of China The Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally built along an east-to-west line across the historical northern borders of China to protect the Chinese states and empires against the raids and invasions of the various nomadic groups of the Eurasian Steppe with an eye to expansion. Several walls were being built as early as the 7th century BC; these, later joined together and
Great Wall Marathon Great Wall Marathon The Great Wall Marathon is an annual marathon race, traditionally held on the third Saturday of May along and on the Huangyaguan or Huangya Pass (Chinese: 黄崖关; Chinese: 黃崖關; Pinyin: Huángyáguān； Literally: "Yellow Cliff Pass"), Tianjin section of the Great Wall of China East of Beijing. Since it first start in 1999, the race has grown to several hundred participants. A locally organized event offering a full selection of runs including a full marathon (42.2k), half marathon (21.1k), 10k, and 5k distances. Aside from the main marathon, a half marathon, 10 km and 5 km runs were