Porta Nigra (Trier)

Germany / Rheinland-Pfalz / Trier / Porta-Nigra-Platz
 gate, Roman Empire, UNESCO World Heritage Site, listed building / architectural heritage
The gate dates back to a time (about A.D. 180) when the Romans often erected public buildings of huge stone blocks (here, the biggest weigh up to six metric tons). The slabs were cut by bronze saws powered by mill wheels (some cutting traces are still visible) and put together without mortar. Instead, two stones each were held together horizontally by iron clamps whose bent ends were embedded in corresponding holes by molten lead. www.trier-info.de


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Wikipedia article: http://en.wikipedia.org/wiki/Porta_Nigra
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Coordinates:   49°45'34"N   6°38'38"E