Travertine is a natural stone material from the limestone family. It is made of calcium carbonate and is usually found in the form of deposits near warm or hot springs. It was frequently used in ancient times as a building material. Travertine is a porous material,and needs to be sealed before use in construction or renovation projects. It is most commonly used for vanity tops and flooring, but may also be used in showers and tub surrounds as well as in exterior decor.