There was a big flood in a place called the Arno in Italy in the year 1966. The Arno is a big river that flows through a city called Florence and a lot of other smaller towns. The flood happened because there was a lot of rain for many days and the river became too big and started spilling over its banks.
The flood was really strong and it destroyed a lot of buildings, roads, and bridges. The water was very high and it even reached the second floor of some buildings. Many people had to leave their homes and go to higher ground to be safe. The flood was so bad that it even covered some famous artworks in the city, like paintings and sculptures, and damaged them.
After the flood, people from all over the world helped to clean up the city and rebuild it. They worked really hard to make sure the city could be beautiful again. Now, people remember the flood as a sad event but also as a time when people came together to help each other and make things better.