Natural Beauty Limestone is a naturally-occurring rock that forms in the ocean from the carbonate shells and skeletons of marine animals. Limestone was used as a building material in many of the great architectural pieces throughout history. The Sphinx, Great Pyramid, Lincoln Memorial, and even the Empire State Building were made using limestone. The natural beauty of limestone has long been admired and you too can incorporate this natural stone in your home. Here are three ways that you can use Limestone on your property.