The Porta Nigra, the largest Roman city gate north of the Alps, the only survivor of four through Trier’s protective walls, the one to the North. Given how orderly the Romans were, you shouldn’t wonder long where the other three went.
It’s black now. Has been since medieval times. Hence Nigra. What did the Romans call it? We don’t know.
Left nameless and blackened, but still an entrance. Think Constantine riding towards it, through a colonnade (marked by those short “pillars” in the picture) on his way to the Rhine and battle …

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