BANGSATAP

If you ever get a chance to visit Jeju Island, you will no doubt be able to see rock piles everywhere.  Now from information that I gleaned from the Net, rock piles are a reminder of Korea's shamanic past.

Korean Shamanists believe that things (yes, including rocks) have spirits just as people do. 

My tour guide told me that putting a rock on top of the pile and making a wish would bring me good luck.  Of course, I placed one to wish for good luck and good health.

In Korean a rock pile is called Bangsatap

Here is info about Bangsatap

Bangsatap are small, round towers made of many stones. There are many Bangsataps and you can see them near the countryside in Jeju. People usually pile up many stones, making a shape like a tower in order to protect themselves from the bad luck in their village. They built Bangsatap according to the theory of divination because they believe that geography is very important in choosing the right place for them. It is also a good example to demonstrate religious belief in Jeju island because it is an object in which people put faith: people put a rice paddle inside the Bangsatap to gather as much money as possible, as well as an iron pot to overcome disaster and fight fire in their village. Nobody knows that when the Bangsatap was built over the year previous.
LINK