English: Pavement of Praça de D. Pedro IV in Lisbon (Calçada portuguesa) of black basalt and white limestone
Norsk bokmål: Brolegning på Praça do Rossio (Praça de D. Pedro IV ) i Lisboa. Mosaikkbrolegning eller "Calçada portuguesa" av svart basalt og hvit kalkstein er utbredt i Portugal og tidligere kolonier.
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