Stone masonry is a form of construction using natural stone and mortar to make load-bearing and non-bearing walls. Benefitting from the inherent durability and weather-resistant properties of natural stone, stone masonry is one of the oldest trades in human history that has been used for buildings, structures, monuments, cities, and sculptures around the world. Because of the differences between various irregular natural stone types, shapes, and sizes, multiple methods of stone masonry construction have been developed in order to respond to unique project demands and locations. Stone masonry types are distinguished by how tooled and shaped the stones are, and whether the stones are laid in consistent mortared horizontal courses or organized in random or uncoursed ways. While traditional stone masonry walls were typically bearing walls, today stone is more commonly used as a non-structural facing veneer that is tied back to a structural concrete or masonry wall.