Construction of the château de Ferragus was decided by the English, on the foundations of a Roman work, at the summit of the promontory overlooking the sea, named Atalaye, used as a whale-observation post. This château had a double crenulated wall two meters thick, a drawbridge and four towers. Mentions of this château occur as late as 1603, in the letters patent of Henry IV. One tower remained as of 1739, when a daymark was established there, called "de la Haille", then "de la Humade". The tower disappeared in 1856.