The conical 15th-century Tour de la Lanterne, so named because of its role as the harbour's lighthouse (lit by an enormous candle), and one of the oldest of its kind in the world, is also referred to as Tour des Quatre Sergents in memory of four local sergeants, two of whom were held here for plotting to overthrow the newly reinstated monarchy before their execution in Paris in 1822.
The English-language graffiti on the walls was carved by English privateers held here during the 18th century.
