In the south of Italy you can visit this amazing village, entirely built on the stone: houses, hotels, restaurants are all dug into the calcarenitic rock itself. Many of these dwellings are really only caverns, and the streets in some parts of the Sassi often run on top of other houses. The ancient town grew up on one slope of the ravine created by a river that is now a small stream. The ravine is known locally as "la Gravina".
The "Sassi of Matera" have being inscripted in the Unesco World Heritage List together with the Park of the Rupestrian churches: they were excavated inside the stone and house beautiful ancient frescoes.