Porta Praetoria

Porta Praetoria is one of Regensburg’s oldest landmarks: a stone gateway built in 179 AD as part of the Roman legionary camp Castra Regina. Tucked into the medieval old town near the Danube, its surviving arch and masonry reveal layers of Roman military engineering within a UNESCO-listed cityscape. Visitors can view the remains from the street at no cost, making it a quick, worthwhile stop for history enthusiasts. Pair it with nearby sites like the Stone Bridge and the cathedral to trace Regensburg’s evolution from Roman frontier to prosperous medieval center.