Last Saturday I was in Saint Basil's Cathedral (the Cathedral of Vasily the Blessed). There is very dim light inside so I couldn't take photos. Furthermore, the day was gray and cloudy.
I didn't know that inside the cathedral there's the men's choir singing a cappella. They are called "Doros". I can't find words to describe that deep and strong impression I got. I wouldn't say that I love choirs. But this choir sings just grandly! I stood looking up and listened to a religious song. It sounded like a prayer. At some moment I seemed to be flying upward.
It was this song:
And here is an excellent video about the cathedral:
There are many mysterious half-light nooks, corners and niches there. All the stairs are very steep. I think at nights it's possible to hear susurration of a monk's cassock somewhere behind you, echo of distant voices from the sixteenth century, and Ivan the Terrible's heavy footsteps.
And I'm sure he was looking out of this window too…