National Treasures of Japan, Itsukushima Main Shrine

The Itsukushima Shrine is a complex comprised of several buildings, some of them being registered as National Treasures of Japan. After I already presented the Marodo Shrine and the corridors, here's the main shrine, actually a complex that includes the main hall, an oratory, an offering hall and a purification hall.
Some of this constructions were built long, long time ago, in 1241...