Porte Gayole

The ramparts were built at the beginning of the 13th century, by order of Count Philippe Hurepel, nicknamed 'the unruly', on the remains of a Gallo-Roman wall. They were fortified in the 16th-17th century. Fortified on the east by the castle, the ramparts count four towers flanked by gates: Gayole, des Dunes, de Calais and des Degrés. The wall walk, which can be reached from each gate, offers a view of the city and the harbor.

The fortified city of Boulogne-sur-Mer is also called "Citadel of Boulogne-sur-Mer", "Old City of Boulogne-sur-Mer" or "Old-Boulogne". The walls were built between 1227 and 1231 by Count Philippe Hurepel, at the exact location of the boundaries of the Roman castrum of Bolonia. These are the best preserved ramparts in the north of France. Their foundations date back to the Roman era ("Classis Britannica" camp) and form a quadrilateral pierced by four gates, which represent the only access to the neighborhood: the "Porte Gayole", the "Porte Neuve" (or "Porte de Calais "), the" Porte des Dunes "and the" Porte des Degrés "the latter is exclusively pedestrian.It is also called" Haute ville "because it is located on a hill at about 60 meters altitude, unlike the "Lower town" (city center and seaside) which is almost at sea level. Https://fr.wikipedia.org/wiki/City_fortifi%C3%A9e_de_Boulogne-sur-Mer