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Actually, that’s [Île Saint-Honorat](http://en.wikipedia.org/wiki/%C3%8Ele_Saint-Honorat), about half a mile from Île Sainte-Marguerite. The big building sticking up in the sea is the 15th century fortified monastery of Abbey Lérins.
(I only know what Île Sainte-Marguerite looks like because Fort Royal on that island is where the Man in the Iron Mask was imprisoned.)