Fifty years ago today, the citizens of Florence woke up to witness the worst flood in their city's history.
After an exceptionally long spell of bad weather, the river Arno had broken its banks, releasing torrents of muddy water into the surrounding streets. At some points in the city, the floodwater reached a height of 6 metres (20 feet)!
35 people lost their lives and countless works of art and rare books were damaged or destroyed.
Thousands of (mostly young) people from Italy and all over the world descended on Florence, offering their help. They soon came to be known as the angeli del fango (angels of the mud), an expression coined by the journalist Giovanni Grazzini.
There are plaques on buildings throughout Florence marking the heights the water reached on that fateful day in early November, 1966.
This was not, by any means, the first time the river had flooded so catastrophically. Since records began in the 13th century, there have been over 40 documented floods, 8 of which have been major catastrophes.
Plaques record exceptional floods in the years 1333, 1547, 1557 and 1844.
In Via Don Giancarlo Setti (formerly Via del Remigio) a graphic plaque records the height the water reached during the flood of of November 4th, 1333. On that occasion the Ponte Vecchio was destroyed.
Many of the plaques are to be found in the Santa Croce quarter, which is the lowest-lying district in Florence.