A group of happy foreign visitors on the Great Wall: a Korean, a Vietnamese and a number of Eastern Europeans. A little further away on the Wall is a group of Africans. The title of the poster is a word play on the Chinese name for what is called the Great Wall in English: 万里长城 - the ten thousand 'li' long great wall. A 'li' is around 500 meters.
This is a print from the second edition (November 1960).