Île Ste-Marguerite, Cannes

The largest of the three Lerin islands, is a 15-minute boat ride from Cannes. In ancient times it was called Lero. Numerous boat companies make the crossing from the old port. Also inhabiting this island is a 17th-century fort, which houses the Maritime Museum . This fort was once a prison, and was the home to the unidentified character, known as the man in the iron mask.