The Fortress of Verdun is a historic military stronghold located in northeastern France. Built in the 19th century, it was designed to protect the region from potential invasions. The fortress features thick walls, bastions, and a complex system of tunnels, making it a formidable defense structure. During World War I, the fortress became famous for the Battle of Verdun in 1916, one of the longest and bloodiest battles in the war. The intense fighting resulted in significant casualties and symbolized the determination of the French forces to hold their ground against the German army.