What ancient structure was built to keep out invaders and is visible from space?

Category: History · Difficulty: easy

Hint: It's a long barrier stretching across a vast country.

Answer

The Great Wall of China

Explanation

The Great Wall of China was constructed to protect against invasions, making it a notable historical structure.

This is an easy history riddle — a good one for children and beginners. The answer is The Great Wall of China.

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