Kremlin

"I will never forget this; I gather
To wail with the wives of the murdered streltsy,
Inconsolably, beneath the Kremlin towers."
(1935 Akhmatova, Requiem)

This is the St Ivan's bell tower inside the Kremlin walls. It's enormously tall and shows over the other 6 churches in the square. You can also see it over the Kremlin walls.