The Citadel of Strasbourg is a historic fortress located in the city of Strasbourg, France. Built in the 17th century under the direction of the military engineer Vauban, it was designed to protect the city from potential invasions. The citadel features impressive walls and bastions, showcasing the military architecture of its time. Today, the Citadel of Strasbourg is a UNESCO World Heritage site and serves as a reminder of the city's rich history. Visitors can explore its grounds and enjoy views of the surrounding area, making it a popular destination for tourists interested in history and architecture.