In 179 AD/CE, the Roman Empire established the fortress “Castra Regina”, or “fortress by the river Regen”, where the Regen enters the Danube river.

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Keywords: -preserved, 2000-year-, architecture, bavaria, castra, city, fortress, germany, heritage, history, imperial, medieval, northern, province, raetia, regensburg, regina, remnants, roman, town, unesco, world