Final answer:
The biggest construction project in the western world in the last 4,000 years was the Great Wall of China.
Step-by-step explanation:
The biggest construction project in the western world in the last 4,000 years was the Great Wall of China. The Great Wall of China was built over many centuries, starting in the 7th century BC and completed during the Ming Dynasty in the 17th century AD. It stretches over 13,000 miles and was built to protect China from invasions. The Great Wall of China is a remarkable engineering feat and a symbol of China's long history.