Three (more) Forgotten Roman Megaprojects

This video explores another three forgotten Roman megaprojects: the colossal gold mines at Las Médulas, Spain; the Anastasian Wall, Constantinople's outer defense; and Rome's artificial harbor at Portus.
You might also be interested in my video on the longest Roman aqueduct: Following the Longest Roman Aqueduct

The first Roman megraprojects video: Three Forgotten Roman Megaprojects

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Chapters:
0:00 Las Médulas
3:13 The Anastasian Wall
5:24 Portus