30 agos 221 año aC - The Great Wall of China

Descripción:

Built mainly during the Qin dynasty under Shi Huang Ti, the Great Wall is one of the largest building constructions, winding north and northwest of beijing and across the mountains of northern China. Ranging to 25' tall and 15-30' thick, it connected old fortification walls and was used in defense against the Huns. Later renovation during the Han and Ming dynasties enlarged it to 4,000 miles.