- booked.net visit/attraction/germany/trier-18274/…Porta Nigra served as a main entrance to the Roman city of Trier, which was once one of the largest and most important cities in the Roman Empire.
- spottinghistory.com view/3785/porta-nigra/In 1986 the Porta Nigra was designated a World Heritage Site, along with other Roman monuments in Trier and its surroundings.
- germany-places.com places/porta-nigra-54290-trierPorta Nigra is a Historical place located in 54290 Trier. It is one of the 264 Historical places in Germany.
- livius.org articles/place/augusta-treverorum-…The Porta Nigra or "black gate", is the most famous building of Trier and has become its symbol. It belongs to the walls of Trier, which were erected during the...
- http://sacred-destinations.com germany/trier-porta-nigraThe Porta Nigra is the only one of four Roman gates that still stands in Trier; the others were gradually pillaged for their stone and iron.
- en.advisor.travel poi/Porta-Nigra-3282In 1986, the Porta Nigra was designated a World Heritage Site, along with other Roman monuments in Trier and its surroundings.
- itinari.com location/porta-nigraDiscover the Magnificent Porta Nigra in Trier: A Roman Marvel. Trier, a charming city in Germany, is home to a remarkable historical treasure - the Porta Nigra.
- historyhit.com locations/porta-nigra/Porta Nigra, translated as the “Black Gate” is a magnificently well-preserved second century Roman gate in Trier, Germany.
- youtube.com watch4 bin görüntülemeYayınlandı30 May 2017
- http://galenfrysinger.com germany_trier_porta_nigra.htmIn 1986, the Porta Nigra was designated a World Heritage Site, along with other Roman monuments in Trier and its surroundings.