TED-Ed: What makes the Great Wall of China so extraordinary

The Great Wall of China, a 13,000-mile structure, was initially built by feudal states to protect against invasions. Emperor Qin Shihuang unified these walls, and the Han dynasty extended them further. Despite its formidable nature, the wall was breached by Mongols. The Ming dynasty fortified it with bricks and watchtowers, but it eventually fell into disrepair. Today, the wall is a cultural symbol, attracting tourists and requiring preservation efforts. Contrary to popular belief, it is not visible from space.

What was the primary reason for the initial construction of the Great Wall during the Chunqui period?

• To unify the feudal states

• To protect against nomadic raiders

• To serve as a trade route

• To mark the boundaries of the empire

Which dynasty was responsible for the significant expansion of the Great Wall using bricks and stones?

• Ming dynasty

• Ching dynasty

• Qin dynasty

• Han dynasty

What was a key defensive feature of the Great Wall during the Ming dynasty?

• Moats surrounding the wall

• Watchtowers for signaling

• Electric fences

• Cannons mounted on the wall

What is the current main purpose of the Great Wall of China?

• Military defense

• Cultural and tourist attraction

• Residential development

• Trade and commerce

Is the Great Wall of China visible from space?

• Yes, it is clearly visible from the moon

• Yes, it is visible from low Earth orbit

• No, it is not visible from space

• Yes, but only with a telescope