Now, a planned glass and steel bridge over Venice's Grand Canal is also threatening to cause irreparable damage.
Designed by Spanish architect Santiago Calatrava, the futuristic structure has been described as an "architectural jewel" and "a carpet of light reflected on water."
But according to a report in La Repubblica on Monday, experts now fear that it could sink the embankment on which it is supposed to rest.
"The bridge's structure does not pose a problem. But we must be absolutely sure that the pavements on which it will rest will hold," Venice Mayor Massimo Cacciari told the newspaper.
Experts have calculated that the 52-ton structure will create a downward force of 1,500 tons, equivalent to 75 large lorries. This weight could sink the sides of the canal, which have been built on a soft, muddy floor.
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