Heptastadion, Ancient causeway in Egypt
The Heptastadion was a crucial infrastructure linking the island of Pharos to mainland Alexandria.
Built by Demetrius Poliorcetes around 280 BC, it played a significant role in Hellenistic Alexandria.
The site represents a blend of Greek and Egyptian engineering marvels.
Though submerged, parts of its remains are still visible under the waters between mainland Alexandria and Pharos.
Originally seven stades long, the Heptastadion epitomizes ancient city connectivity and defense.
Location: Alexandria
Source: Wikimedia