Stone Stacks of Blow Hole Cay, Bahamas

We were exploring Blow Hole Cay when we can upon the rock stacks. They look like prehistoric like Stonehenge perhaps.

They are located in various places on to of the hills. I did some research and all I found was that these were erected by passing visitors and that the meaning of the structures is to say ‘I’m coming back eventually'. That's cool so I left a rock on one of the stacks.