Harbors Gallery

The Römerbrücke of Trier, one of the Roman empire's four capitals. Attribution to Berthold Werner/Wikipedia. 

An aerial shot of the harbor at Carthage, one of the most used ports in Late Antiquity. Attribution to Google Earth.

An aerial shot of "portus," the artificial harbor in Rome. Note the hexagonal shape. Attribution to Ra Boe/Wikipedia. 

The modern portus, out of use and covered in reeds. Attribution to Douglas Boin/Living Late Antiquity Team, with help from the British Library.