The document summarizes 10 of China's most beautiful highways: 1. The Hangzhou Bay Bridge is the world's longest trans-oceanic bridge at 36 km long. 2. China has 6 hanging cliff-side highways built into mountainsides, including the famous Guoliang Highway. 3. The Zhongnanshan Highway Tunnel in Qinling Mountains is the world's longest double-tube highway tunnel at 36.04 km long. 4. The Aizhai Highway in Hunan Province has 13 turns winding up a mountain. 5. The Aizhai Bridge in Hunan spans 1,176m making it the world's 3rd longest and Asia's longest