The rock church in Helsinki is very special. It is very different from the church that usually has a traditional cross and a podium. The whole church is made of natural rock. It is not visible outside. It is hidden. It is like digging a big hole in the ground. The only church in the world built on rocks. The exterior walls of the church are inlaid with copper, the inner walls completely preserve the original granite, and the top is designed with a large hollowed wooden roof. The sun shines through the cracks into the church, complementing the huge organ that stands inside. Occasionally, small water drops are occasionally left on the surrounding rock walls, and in some places, small wooden barrels are placed on the water. So, instead of a church, it is more like a small concert hall. The music reverberation effect caused by the rock is comparable to that of the speakers. No wonder there are music performances such as piano performances. Unfortunately, I went twice, twice close to the closing time, and missed the wonderful music, hoping to get the next chance.