Kazan Cathedral (Казанский собор), Irkutsk (must see)

Kazan Cathedral was built in 1894 in the Russian-Byzantine style. It is an impressive building, accommodating up to 5,000 parishioners at a time. The cathedral stands 60 meters tall, and it is considered one of the most beautiful churches in Russia. To compare dimensions, the massive Saint Isaac's Cathedral in Saint Petersburg can accommodate 8,000 parishioners.