During a visit to Germany's oldest city, Trier, it is a must to see its greatest landmark, the UNESCO-listed Roman city gate, Porta Nigra, also known as the 'Black Gate'. The impressive structure is erected around the end of the 2nd century, and was included in the UNESCO World Heritage List in 1986. Porta Nigra is the best preserved Roman north of the Alps, and today much is still being done to preserve and preserving this historic gem.
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