Great Wall of China

The Great Wall of China is the biggest man made structure on Earth, and also one of its biggest mysteries. Investigators look into the reasons behind the wall's construction, and the secrets... Read allThe Great Wall of China is the biggest man made structure on Earth, and also one of its biggest mysteries. Investigators look into the reasons behind the wall's construction, and the secrets of one of history's greatest empires.The Great Wall of China is the biggest man made structure on Earth, and also one of its biggest mysteries. Investigators look into the reasons behind the wall's construction, and the secrets of one of history's greatest empires.