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Its well known that Caesar had plenty of grand plans that were never enacted. Along with his various military projects, there were plenty of equally grandiose infrastructure projects. Plutarch records them as:

While this expedition was going on he proposed to dig a canal through the isthmus of Corinth, and had already put Anienus in charge of this undertaking. He also planned to divert the Tiber just below the city into a deep channel, which would bend round towards Circeii and come out into the sea at Terracina, so that there would be a safe and easy passage for merchantmen to Rome. Then too he proposed to drain the marshes by Pometia and Setia and to create a plain which could be cultivated by many thousands of men. He also intended to build great breakwaters along the coast where the sea is nearest to Rome, to clear away all the obstructions which were a danger to shipping at Ostia, and to construct harbors and roadsteads big enough for the great fleets which would lie at anchor there.

So, what if Caesar actually embarked upon any of these projects before being assassinated?

- As far as Corinth is concerned, Nero attempted (and failed) to do the same a century later.
- Caesar's supposed new route for the Tiber was... ambitious. Suffice to say, it'd clock in at around 90 miles long. Rome's only around 25 miles from the coast.
- The harbor expansions are probably the most realistic, seeing as Ostia was developed further by the Roman Emperors.
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