In 2003, Italy began building 78 movable gates to protect Venice from exceptionally high tides; after 17 years of construction and testing, the barriers were shown to work

Venice has long experienced periodic flooding because of its location within a shallow coastal lagoon connected to the Adriatic Sea. The city's unique setting has shaped its history, but it has also left homes, public spaces and historic buildings vulnerable whenever exceptionally high tides push seawater into the lagoon.

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