WOW! Dry-laid stone retaining walls are amazing!
Benefits of dry-laid stone retaining walls:
-They resist fire, water and insects.
-They can be recycled due to the dry-laid method.
-They provide natural drainage without any damage to the structure, unlike mortared walls, which tend to crack and break into sections.
Note: You may not want to use the dry-laid method right up against a swimming pool because of the silt that filters through the stone wall from rain or sprinklers. A dry-joint method would be a better choice to achieve the same look.