The Porta Nigra, also called Porta by the locals, is a sizable Roman city gate located in Trier, Germany. A UNESCO World Heritage Site, that is. Because of the darker color of the stones, Porta Nigra got its name in the Middle Ages; the Roman term has not survived. Grey sandstone was used to build the Porta Nigra after 170 AD. Two four-story towers projecting as near semicircles on the exterior made up the original gate. On either side of the two gate openings was a small courtyard. Unknown factors however prevented the construction of the gate from being completed. For instance, the stones on the northern outer edge of the gate were never worn down, and the stone-protrusion would have prevented the installation of moving gates.
Still, for centuries until the end of the Roman era in Trier, the gate served as the town-entrance. Located at each side of the roughly rectangular Roman city, the Porta Nigra was one of four city gates that existed throughout the Roman era. While the Porta Alba, Porta Media, and Porta Inclyta were constructed in the east, south, and west, respectively, alongside the Roman bridge that spans the Moselle, it protected the northern entrance to the Roman city. The Roman city of Trier had two main streets, one running north-south and the other east-west. The gates were located at the ends of these streets. Only the Porta Nigra is still in use out of all three gates. #History#Architecture
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