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| | The port of Claudius |
 | | The new port was aimed to meet the increased needs of the city of Rome, which used the inadequately-sized river port at Ostia and the distant port of Pozzuoli during the Republican age. |
 | | A large signalling light was placed at the entrance to the port, founded on a large sunken ship that had been used to transport the Vatican Circus obelisk to Rome, on Caligulas orders: the ship was brought to its final destination, sunk and used as a mould for the underwater foundations of the lighthouse. |
 | | A technique that was described by Vitruvius, well-known in ancient times, was used to build the sea wharf: wooden moulds were built, anchored to the sea bed using vertical stanchions, which were filled with concrete and which formed the core of the wharf structure. |
| www.adr.it /content.asp?L=3&idMen=707 (677 words) |
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