Zitadelle

The oldest structure inside the citadel (and the oldest secular building in Berlin) is the Juliusturm, dating back to about 1160. The bulk of the Zitadelle was designed in 1560-94, in the style of an Italian fort, to dominate the confluence of the Spree and Havel rivers. There are two museums. One tells the story of the citadel; the other is about local history.