The term travertine derives from an old Roman name for Tivoli, an Italian town where large deposits of the calcium carbonate can be found. Travertine quarried in Tivoli under the late Roman republic as well as the early empire was an extremely popular building material. It was, for instance, utilized to create the exterior of the famous Coliseum in Rome. Significant deposits of travertine also occur at Mammoth Hot Springs in Yellowstone National Park, Wyoming and various other locations around the world where limestone is common and calcium carbonate is present in circulating ground water.