Although it looks like some combination of the moon or a desert, it's actually black volcanic ash and pumice near the summit crater of Mt. Etna.
The town of Caltagirone in southern Sicilia, world-famous for its ceramics. Specifically, colorful majolica tiles.
The centerpiece of Caltagirone is the 250 stairs of La Scala di Santa Maria which connect the old city with the new city. Each stair has been designed with a unique tile pattern -- no two of them are alike.