Where are the Berlin wall Great Wall of China?

The Berlin Wall was a guarded concrete barrier that divided Berlin, Germany, from 1961 to 1989. Constructed by the German Democratic Republic (GDR, East Germany), starting on 13 August 1961, the Wall completely cut off (by land) West Berlin from surrounding East Germany and from East Berlin. The barrier included guard towers placed along large sections of the wall, as well as a wide area (later known as the "death strip") that contained anti-tank obstacles, mines, and other defenses. The Eastern Block claimed that the Wall was erected to protect its population from fascist elements conspiring to prevent the "building of socialism" in East Germany.

Great Wall of China:

The Great Wall of China is an ancient Chinese fortification originally constructed during the Qin dynasty in the 3rd century BC to protect the Chinese Empire from various nomadic groups from Central Asia. Several walls were being built from as early as the 7th century BC, with selective stretches later joined together by Qin and subsequent dynasties. The Great Wall has many purposes, most important to which was to protect the Silk Road, an important trade route between China, the Middle East, Europe, and Africa. The Great Wall is made of different materials such as stone, earth, wood and other local materials. The wall is about 21,196 km (13,171 mi) long, extending from Shanhaiguan in the east to Jiayuguan in the west.