World Heritage Itsukushima Shrine is located in the Miyajima Island in Hiroshima Prefecture.
It was built by a powerful samurai, Taira no Kiyomori, about 1400years ago. When tide is up, a big red torii gate looks as if floating over the sea.
At low tide, you can walk to the the torii gate.
The bases of the pillars of the torii gate are not buried in the ground but simply placed on the shore under which there are about 1000 piles.