Fort Saint Louis

Fort Saint Louis is a seaside fortress in Fort-de-France, Martinique. The present-day fort has evolved from earlier strongholds that were erected on the site as early as 1638, and has been known in previous incarnations as Fort Royal and Fort de la Republique. The modern-day Fort Saint Louis is both an active naval base and a listed historic site of France. There are daily tours of the fort, though the portion that is still a naval base is off-limits.

Source: Wikipedia