The document discusses the Hangzhou Bay Bridge in China. It is the longest sea-crossing bridge in the world at 36 kilometers long. It took 9 years and 600 engineers to plan and design. The bridge links Ningbo and Jiaxing, cutting 120 km off the driving distance between Shanghai and Ningbo. Unique features include a service center in the middle of the bridge with a hotel, restaurant, and observation tower allowing visitors to see the extraordinary tides in Hangzhou Bay. The S-shaped design allows it to withstand typhoons and hurricanes.