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National Geographic Photo of the Day

October 13, 2012 at 09:30AM

This Month in Photo of the Day: National Geographic Magazine Features


TRIER, GERMANY

The Porta Nigra, or "black gate," still dominates Trier, Germany. A hundred feet tall, it was built in the second century as part of four miles of walls. Trier was a major city in the late Roman Empire, even serving as a regional capital under several emperors.


See more pictures from the September 2012 feature story "Roman Frontiers."




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