The buildings of Venice are constructed on closely spaced wooden piles. Most of these piles are still intact after centuries of submersion. The foundations rest on the piles, and buildings of brick or stone sit above these footings. The piles penetrate a softer layer of sand and mud until they reach a much harder layer of compressed clay.
Venice History
The city is often threatened by flood tides pushing in from the Adriatic between autumn and early spring.
Six hundred years ago, Venetians protected themselves from land-based attacks by diverting all the major rivers flowing into the lagoon and thus preventing sediment from filling the area around the city. This created an ever-deeper lagoon environment.
In 1604, to defray the cost of flood relief Venice introduced what could be considered the first example of a 'stamp tax'.
