Marble is metamorphosed limestone, which means it is limestone that re-solidifies after melting down. In an architectural context, marble is widely used for floorings, due to the patterns that it has, which makes it attractive and aesthetic. A pure white variety of marble is used to build statues for display in interiors and other spaces. Marble is mostly used as a decorative stone. Even though it has a high resistance to water, it is easily affected by acidic components in the environment. A classic example available is the present discoloration and corrosion of marble structure of Taj Mahal.
Marble is a much renowned natural stone from the times of the Greek and the Romans, right from the use in statues to iconic architecture. These stones need much care and should be kept out of contact of acidic agents to preserve it for a long time. Classic examples of historic structures are the Leaning Tower of Pisa, the Taj Mahal and the Parthenon.