Shibam, in Yemen's Wadi Hadramaut, is a walled city of sun-dried mud-brick tower houses up to seven storeys high, laid out on a rectangular grid of streets and squares. UNESCO, which inscribed it in 1982, calls it one of the oldest and best examples of urban planning based on vertical construction. Its nickname: the Manhattan of the desert.
Source: UNESCO World Heritage Centre, Old Walled City of Shibam.
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