trier unesco world heritage site with roman porta nigra city gate rhineland palatinate germany |
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| navigate by keyword : architecture building built capital capitals cathedral century church city clouds cloudy constantine diocletian emperor empire estate europe facade fortification fortifications four gardens gate gates german germany great heritage historic landmark monastery moselle nigra one originally palace palatinate park porta quail rhineland river roman ruins saint sandstone second served simeon site tourism town treverorum trier unesco valley west western world |
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| The Roman city gate of the Porta Nigra was originally built as one of four gates in the Second Century before Augusta Treverorum served as one of the capitals of the Roman Empire under Emperor Diocletian and under Constantine the Great, Trier, UNESCO World Heritage Site, Rhineland Palatinate, Western Germany |
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