For me is the Santa Maria de Miracoli. Its tiny and incredibly beautiful - some of the most gorgeous delicate marble carvings. Hard to find - between Rialto and the Fondamenta Nuova but after winding around and around the calles surrounding it you suddenly come upon it. Restored recently it shines like a small wedding cake in the sun.
But I would find it romantic - my husband proposed to me there. A year later we got married in the Venetian wedding registry in a wonderful palazzo on the Grand canal.
That was pretty romantic too.
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