When it comes to German attractions, the city of Trier is far less well-known to Asians than attractions such as Königssee and Neuschwanstein Castle, but Trier is a historic city with a lot of standing. Built in 16 BC, more than 2,000 years old, with a large number of Roman ruins, the whole city has many World Heritage Sites, and is an ancient German city worth a visit. The Nigra Gate, also known as the Black Gate, is located in Trier, Germany, and is the city gate of the ancient Roman period and is the symbol of the city of Trier. Nigra Gate is the best preserved Roman era city gate north of the Alps, in 1986 together with other ancient Roman sites and cathedrals in Trier was designated by UNESCO as a World Heritage Site Black Gate was originally one of the gates of the Roman city wall in the second century, after the Middle Ages, the city gate gradually became black after weathering, climate, pollution and other factors, which is the reason for the name of the Black Gate. Trier was also Marx's hometown.
