8. Hangzhou Bay Bridge Opened in the mid of 2008, Hangzhou Bay Bridge is a highway bridge that connects Jiaxing and Ningbo in Zhejiang, China. With a length of 35.673 km Hangzhou Bay Bridge is the longest sea crossing bridge in the world. The bridge is slightly S-shaped which helped it withstand the element and its he manufacturing cost was around US $ 1.7 billion.