Once used to build ancient Roman structures such as the Colosseum, travertine is a centuries-honored sedimentary limestone that's formed overtime by natural mineral deposits into hot springs. A warm, sandy-hued alternative to marble, travertine stone features a distinct canvas of porous marks and swirling patterns from its calcareous layers. Here, mixed slabs of grey and cream travertine stone offer a modern, asymmetrical side table that's finished with a honed travertine top for a smooth, matte finish.