Kojima Shrine is one of the many shrines on Iki Island.
This shrine usually floats in the sea, but you can walk the approach to it at low tide.
It's like Mont Saint Michel in France.
This is famous as a spiritual place for Japanese people to meet God.
Access
About 2 hours by ferry from Hakata Port in Kyushu to Iki Island
Edited by @keikofukuda