Despite the lack of mortar, the structure is surprisingly stable.
Trulli were built during a period of history, when the construction of stable dwellings was highly-taxed.
This is known to have occurred in 1644 to thwart tax inspectors sent by the King of Naples.
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Trulli were constructed using roughly worked limestone boulders collected from neighboring fields.
The structural walls are laid directly on the bedrock, after removal of the topsoil when necessary.
However, during the winter months, the trullo becomes chillingly cold.
Truli construction started in the mid-16th century and continued into the early 20th century.
Construction of new trulli quickly declined from the 19th century.
New trulli are no longer built in Alberobello.
