When the Romans laid the foundation stone for the Porta Nigra in 170 AD, they could hardly have imagined its success story. After all, the city gate was only one of four in Trier at the time - and of many in the entire Roman Empire. Today, some 1850 years later, the "Black Gate" is the best-preserved Roman city gate north of the Alps and THE sight to see when it comes to Roman rule in the areas of modern-day Germany.
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