The stylized lamp is adorning one of the porches.
The viewer sent very interesting story to me:
During the war the Nazis observers used the cathedrals elevation
for directing the fire. So Russian Navy in Kronstadt was trying to
destroy it for some time. The most amusing is the fact that the very
same person who use to direct the Russian artillery was in tern put in
charge of the cathedrals restoration after the war.