The sprawling Spandau borough is known for its parks and waterways, plus the charming Spandau old town, with half-timbered houses and lively cafes. Spandau Citadel is a 16th-century fortress that hosts open-air concerts, is home to a history museum, and has a bat colony in its cellar. South along the Havel River in Kladow is the Military History Museum, with a vast collection that includes WWI and WWII airplanes.