This is one of the biggest Russian Orthodox cathedrals in Moscow, and the inside is stunning. There are icons everywhere and it is filled with gold-tinged ceilings, candle-stands, and the smell of beeswax. On Sundays, the church is particularly crowded, and if you can’t get inside, they broadcast the service on the screen outside the church. This is where the punk-rock group Pussy Riot performed their punk-prayer (and spent time in jail for it), and also where the Russian Orthodox faithful come for prayers. The number of Orthodox holidays is astounding, and it seems almost every Sunday is a holiday and you must get to see the Patriarch leading prayers. If you’re a woman, you must cover your hair (like in all Russian Orthodox churches), and sleeves are a must. If you forget a scarf, they have some by the entrance. If you want to get a candle and light it in prayer, do so. They sell the candles at the little shop in the back of the church. Also, the square candle bases are to put a candle for prayers for the dead, and the circular candle base are for prayers for the living.