Travertine has been used for thousands of years in many amazing structures all over the world. It is a type of limestone that is created from very high heat and pressure. Travertine is very porous and somewhat resembles marble. It is even referred to as onyx marble at times. It is formed and imported from areas in Italy, Turkey, Mexico, and the Middle East. It comes in many earth tone hues, such as walnut, cream, gold, beige, ivory, and coral red.