The Tour Saint-Nicolas is a historic tower located in the city of La Rochelle, France. Built in the 14th century, it served as a defensive structure to protect the harbor and the city from naval attacks. The tower stands at approximately 37 meters tall and features a circular design, showcasing the architectural style of the period. Today, the Tour Saint-Nicolas is a popular tourist attraction, offering visitors panoramic views of the surrounding area from its summit. It is part of a trio of towers that once guarded the entrance to the Old Port, along with the Tour de la Chaîne and the Tour de la Lanterne.