Travertine is generally used for floors, walls, countertops and for outside as cladding and pavement. Travertine is generally filled with grout before it is honed or polished, which produces a uniform surface more like other marbles. Unfilled travertine is also quite beautiful, and is often seen as exterior surfaces of buildings. Travertine stones result from hot spring water penetrating up through underground limestone. When the water evaporates, it leaves behind layers of dissolved limestone and other minerals, giving it its banded appearance. Travertine stones are generally light-colored beiges and tans.