"The trulli, limestone dwellings found in the southern region of Puglia, are remarkable examples of drywall (mortarless) construction, a prehistoric building technique still in use in this region. The trulli are made of roughly worked limestone boulders collected from neighbouring fields. Characteristically, they feature pyramidal, domed or conical roofs built up of corbelled limestone slabs." -- "The Trulli of Alberbello." UNESCO World Heritage Center.
"Alberobello, the city of drystone dwellings known as trulli , is an exceptional example of vernacular architecture. It is one of the best preserved and most homogeneous urban areas of this type in Europe. Its special features, and the fact that the buildings are still occupied, make it unique. It also represents a remarkable survival of prehistoric building techniques." "The Trulli of Alberbello." UNESCO World Heritage Center.
"These buildings were constructed using roughly worked limestone boulders collected from neighbouring fields and, later, the large water-collecting basins in the area. They were built directly on the underlying natural rock, using exclusively the drystone technique. The walls that form the rectangular rooms are double, with rubble cores, and are pierced by small windows. Fireplaces, ovens and alcoves are recessed into the thickness of the walls. The roofs, which are also double-skinned, spring directly from the walls, simple squinches allowing the transition from the rectangular to the circular or oval sections of the roofs themselves." -- "The Trulli of Alberbello." UNESCO World Heritage Center.
"Tradition has it that drystone walling was imposed upon the new settlers so that their houses could be quickly dismantled. This served two purposes: recalcitrant householders could be dispossessed easily and, later, it would be possible to avoid taxation on new settlements. In the latter case the buildings could be reconstructed equally rapidly. This is known to have occurred in 1644 to thwart tax inspectors sent by the King of Naples. However, historical and comparative analysis suggests that this technique was no more than a minimal physical response to local conditions and circumstances, later to be exploited for fiscal or punitive purposes." --"The Trulli of Alberbello." UNESCO World Heritage Center.
And finally, a video from UNESCO:
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