text: To the west of the Accademia , the Ca ' Rezzonico is another canal-side design of Longhena , completed in the 18th century and now a museum ( reopened in 2000 ) dedicated to those swan-song years of the Venice 's Most Serene Republic , la Serenissima .
  
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  The museum , a design of Longhena , is dedicated to la Serenissima .