In the case of Etruscan tombs, tufa was commonly used due to its ease of carving and its ability to withstand the weight of the earth and vegetation above it. The Etruscans typically carved their tombs into the sides of hills or cliffs, and then used tufa blocks to construct the walls and ceilings of the tombs. The porous nature of tufa also allowed for the tombs to be decorated with intricate carvings and frescoes, many of which have survived to this day.