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- 01Castra Regina was built in 179 CE to garrison Legio III Italica on the Danube frontier of the Roman Empire.
- 02The fort's massive sandstone corner tower, the Porta Praetoria, still rises above street level in central Regensburg today.
- 03Regensburg's medieval street grid follows the Roman fort's internal axes — the legionary plan still organizes a living city.