Venice, Italy, is known for its beautiful buildings and waterways, or canals.But the way that the 1,600-year-old city was built makes it especially at risk of damage from sea-level rise.Rising sea levels are increasing the number of floods during high tides.And for many years, Venice has been slowly sinking.Climate scientists and world leaders plan to meet later this month in Scotland for a major United Nations climate conference.They will be thinking of the future of coastal cities like Venice.Last month, the European Geosciences Union released a new study on Venice.It found that the Italian city could see a sea-level rise of 120 centimeters by the end of the century.That is 50 percent higher than the worst-case average that U.N. scientists have predicted for worldwide rising sea levels by 2100.One of the most famous places in Venice is St. Mark's Basilica.