UK's Queen at opening of climate change conference

The video covers Queen Elizabeth II's visit to Brandenburg, starting with her journey on the Berlin S-Bahn to Potsdam, where she was warmly welcomed by local children and officials. The Queen then visited Schloss Zizilienhof, where she attended a lunch and praised the development of the new federal states post-reunification. She emphasized the need for continued economic reforms. The visit concluded with a trip to Kronhut Baumstedt, a historical estate of the Hohenzollern family.

What historical site did Queen Elizabeth II visit during her trip?

What was the significance of the Kronhut Baumstedt in relation to Queen Elizabeth II's ancestors?