Nanjing City Wall is one of the key historical and cultural remains of Ming Dynasty (1386) with an original perimeter of about 35 kilometres, the City Wall has a height 14-21 meters and the footing has a width of 14 meters. The present remains have a length of about 21 kilometres. Nanjing is one of the few cities in China that still have old city walls, and even though it has a history of about 600 years it is still spectacular. Up to 350 million bricks weighing up to 10kgs each were used and are inscribed with the names of officials who were responsible for the quality of the bricks.