The Hangzhou Bay Bridge in China is the longest sea-crossing bridge in the world at 36 kilometers long. It took 9 years and cost $1.7 billion to plan, design, and construct the S-shaped cable-stayed bridge linking Ningbo and Jiaxing. The bridge features a 6-lane highway and cuts 120 km off the drive between Shanghai and Ningbo. It also has a unique 10,000 square meter service center in the middle with a restaurant, hotel, and observation tower allowing visitors to view the tidal waves of Hangzhou Bay.