Recognised as one of the new seven wonders of the world, The great wall of china is one of the most protected cultural relics of China. It is also a world heritage site and visiting here will indeed be a memorable experience. It is believed that building of this structure took approximately 1600 years and was over 21 000 kilometres long when the constructing was concluded. Over 800 000 people were involved in building this massive structure and the workforce included soldiers, peasants convicts and slaves.