Augusta Treverorum rose to be the biggest Roman city north of the Alps in the late Roman Empire. Founded in the times of Augustus, this town at the river Moselle was built up by generations of Roman architects to be the Emperor's residence and a world-renowned city in the early 4th century.
The remains of its most impressive structures can still be visited in modern-day Trier, foremost among which is the massive Porta Nigra - the "black gate". …