Jesus Aguilar and Melquidez Miliam are building limestone walls using the dry stone method that curve around a huge tree in the park that’s under construction at the water treatment plant off of Lexington Avenue. The men are part of Aguilar Masonry from Cynthiana. Miliam said the stone came out of the ground from their farm and they used a stone splitter to break the rock into manageable pieces. Dry stone construction uses no mortar and the precise placement of stones makes the walls solid. Miliam said their stone walls will last for decades.