The construction of natural stones bonded together with mortar is termed as stone masonry construction. The inherent durability and weather-resistant properties of natural stone make it one of the oldest trades in human civilization. They have been used for building structures, monuments, cities, and sculptures around the world such as the ancient pyramids in Egypt, the Great Wall of China and Greek and Roman ruins. Most modern stone houses have stone faces only, usually the entire wall is not made of stone.