Fort #5 'King Frederick Wilhelm III' is a historical fortification located in Kaliningrad, Russia. Constructed in the late 19th century during the reign of King Frederick Wilhelm III, the fort was part of the city's defensive network, then known as Konigsberg. It is an exemplar of Prussian military architecture of the time, designed to resist both direct assault and artillery fire. The fortress features several armored cupolas, barracks, and a deep moat. During World War II, the fort saw significant combat when the city was besieged. Post-war, the area became part of the Soviet Union, and many German-era buildings were repurposed or fell into disrepair. Today, Fort #5 has been preserved as a military-historical museum, allowing visitors to step back into history and explore the extensive underground tunnels, barracks, and exhibitions relating to the site's military past. The fort represents the complex history of the region, reflecting a mix of German and Russian influences, and is a poignant reminder of the area's strategic military importance through the ages.