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Nuraghi
of Palmavera (Sassari). The massive double wall circle has the
practical purpose of condensing humidity and preserving water
in the underground hydraulic devices, like the principle on which
the southern Arabian mahfid are based.
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In
Petra (Jordan) the stone terracing systems called khaur, typical
of the Nabatean agriculture used in the Negev desert, are still
visible. In rural environments, they are mere semi-circular terracing
systems which retain the soil, whereas in urban areas they are
more complex building systems. Some examples of these systems
made with carbon layers to filter water and make it fit for drinking
have been discovered.
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