packed than today, being surrounded by enclosed gardens.

The urban trulli still extant in Alberobello date from the eighteenth, nineteenth and twentieth centuries. After having undergone a process of densification in the first decades of the twentieth century, the trulli settlements began to be deserted during the second half of the twentieth century.

The rural trulli, on cheaper land, ceased to be built when the cost of labour began to rise in the twentieth century. The sheer expense of handling the hundreds of tons necessary

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