The Trulli of Alberobello
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.
from UNESCO’s website
As far as I could tell, everyone in Alberobello earns their living by selling things to tourists. Which is okay. One of things that struck me in our travels in Sicily and Italy was the general quality of the items sold to tourists, which usually tended to be practical, even when decorative. Items for sale were based on the local history and culture. So, not one Smurf item even though the buildings resembled their cartoon homes.