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Trier Porta Nigra BW . de Porta Nigra in Trier besterhaltenes rmisches Bauwerk nrdlich der Alpen UNESCO Weltkulturerbe en Porta Nigra Black Gate in Trier Germany best preserved Roman building north of the Alps and World Heritage Site of UNESCO La Porta Nigra Porte Noire de Trves en Allemagne est le btiment romain le mieux prserv