Venice has been sinking for years and is showing no signs of stopping. It has sunk by nine inches in the last 100 years. Rising sea levels play a role (the sea level rises 4-6 mm a year) and more and more severe floods are also contributing to the disappearance of the city. Compared to 100 years ago, when it would flood about 9 times a year, today, St. Mark’s Square floods about 100 times per year.