Travertine is a form of limestone with unique porous veins that give the milled tile their beauty. The stone is found in a wide variety of natural colors, and four different finishes may be applied to individuals. Travertine has long been used in many of the most beautiful buildings in the world. Today, in addition to being an excellent flooring material,s may also be used as pavers,s, stair treads, columns, sinks, and even bathtubs.