The Pope's Revenge
When the sun hits the steel sphere, a bright cross of light appears on it. In officially atheist East Germany, Berliners nicknamed it "the Pope's Revenge".
East Germany built it to be seen from everywhere, including West Berlin. At 368 meters it's still the tallest structure in Germany. Here's what you're looking at, and what to listen for when you get there.

When the sun hits the steel sphere, a bright cross of light appears on it. In officially atheist East Germany, Berliners nicknamed it "the Pope's Revenge".
The tower was placed at Alexanderplatz to stand over the whole divided city as a show of socialist technology. It opened in October 1969, for the 20th anniversary of the GDR.
The restaurant in the sphere rotates slowly, about once an hour, so a long meal gives you a full tour of Berlin's skyline without leaving your seat.
368 meters, the tallest structure in Germany.
Yes, an elevator takes visitors to the observation deck at about 203 meters.
Yes, it turns slowly, about once an hour.