Great Wall of China

The basics of the Great Wall of China

Height: 9,14 meters (30 feet)
Length: it's 21196.18 kilometers
Why they built the Great Wall: The main purpose of this wall was protection, protection against attacks and invasion from the north ( Mongols )

The Great Wall of China in the 18th century

The Great Wall of China was constructed over several centuries and claimed the lives of thousands of builders.