Rotterdam, Netherlands [huanqiu.com]

3. About half of Rotterdam city is lower than the sea level. For centuries, this important seaport in Netherlands depends on the dykes and dams to avoid the invasion of sea water. At the end of 1990s, a storm surge barrier Maeslantkering, which can resist the circumstance when the sea level rises up to 4.88m, was constructed to protect the city. However, it can not solve all problems under the frequent shifts in climate.