Fort Saint-Nicolas is a historic fortress located in Marseille, France. Built between 1660 and 1664 under the orders of King Louis XIV, it was designed to strengthen the city's defenses and assert royal power in the region. The fort features a massive stone structure and a prominent watchtower, overlooking the Old Port. The fort played a significant role in the military history of France and served various purposes over the centuries, including as a prison. Today, Fort Saint-Nicolas is a popular tourist attraction, offering visitors insights into its architectural significance and the history of Marseille.