- 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.
- atlasobscura.com places/porta-nigraBuilt in grey sandstone just before the year 200, Trier’s Porta Nigra represents the last bastion of the Roman Empire’s presence north of the Alps.
- 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.
- 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.
- 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...
- geomerid.com en/place/porta-nigra-trier-travel-…After his death in 1035, he was canonized, and the Church of Simeon of Trier was built based on the construction of the Porta Nigra.
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- 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.
- 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.
- worldtravelimages.net Trier_Portanigra.phpPorta Nigra (Black Gate), an impressive large dark gate built by the Romans as main gate throught the city wall. This is the gate to Trier's Old Town and...