Visited a Catholic cathedral, biggest one in Russia (and maybe "main" one). Not for religious purposes, but for some classic music concert, mostly for pipe organ that they have.

It is pretty interesting to find such foreign building in Russia, where Catholic temples are very rare, especially considering that cathedral was built in neogothic style.

https://en.wikipedia.org/wiki/Cathedral_of_the_Immaculate_Conception_(Moscow)

Concert was good, although compositions were unknown for me (they announced Bach, Handel and Debussy, but I couldn't remember any melody). I'm not serious classic music listener though, so maybe don't understand something anyway.It wasn't an orchestra, but harp, flute, violin and pipe organ, sometimes only two instruments played at once.

1, 2 - outside view. It was raining and cold.
3, 4 - inside.