The Great Wall File

: Features watchtowers for signaling (smoke/fire) and beacon towers for communication.

: Most visible stone sections were built during this era. 🛠️ Engineering Marvels The Great Wall

The Great Wall of China is a massive defensive system spanning over 13,000 miles. It was built over 2,000 years to protect China's borders and regulate trade. Core History and Purpose : Features watchtowers for signaling (smoke/fire) and beacon