Scenery sketch for Mussorgsky's opera "Khovanshchina", 1920 https://t.co/AnxGOSQuHP #roerich #artnouveau https://t.co/Jk4MGG5iYf8965472 Scenery sketch for Mussorgsky's opera "Khovanshchina", 1920 https://t.co/AnxGOSQuHP #roerich #artnouveau https://t.co/Jk4MGG5iYf