Spandau Citadel is a historic fortress located in the city of Berlin, Germany. It was built in the 16th century and has since served as a military stronghold, a prison, and a museum. The citadel is surrounded by a moat and is entered through a drawbridge. The fortress is made up of several buildings, including a chapel, a guardhouse, and a prison. The walls of the citadel are made of red brick and are adorned with decorative elements such as turrets and battlements. The interior of the fortress is equally impressive, with vaulted ceilings, intricate carvings, and ornate furnishings. Visitors can explore the various rooms and exhibits, which showcase the history of the citadel and the city of Berlin. The fortress also features a large courtyard, which is used for events and concerts throughout the year. Overall, Spandau Citadel is a must-see attraction for anyone interested in history, architecture, or military fortifications.