Caption:
Model on a scale of 1:50. Construction site of the Regensburg Porta Praetoria. Situation, 179 AD. The camp of the Roman legion Castra Regina, on which Regensburg was built, was established late in the 2nd century AD on the Danube. The camp had four gates. The main gate, constructed without mortar, the porta praetoria, still stands today. The German Historical Museum. Berlin. Germany.