The Barrage Vauban is a historic lock and defensive bridge crossing the River Ill in the city of Strasbourg, France. Constructed between 1686 and 1700 during the reign of Louis XIV, it was part of the city's fortifications designed by Vauban, a French military engineer. The purpose of the structure was to defend Strasbourg by allowing the ability to flood the southern part of the city in case of an attack, rendering it impassable to enemy troops. The Barrage Vauban is a fine example of 17th-century military architecture and now stands as a significant heritage site emblematic of Strasbourg's past. The bridge is notable for its rooftop terrace, which offers panoramic views of the city's historic center, including the Cathedral of Our Lady of Strasbourg. Inside the barrage, visitors can find sculptures and a permanent exhibition that recounts the history of Strasbourg's defenses. The Barrage Vauban not only serves as a historical landmark but also as a pedestrian bridge and a cultural venue, connecting the city center with the Neustadt district and contributing to Strasbourg's vibrant urban life.