The spread of greek culture.
the spread of Greek culture.
The creation of the Napoleonic Code.
enabling transportation and communication
If you are referring to Alexander the Great, his most widespread achievement was the spread of Greek culture. This happened through the spread of the Koine Greek Language. I rode past a gym. When I opened a book, I saw that its chapters had been set up systematically according to a western thought system. Western thought puts items in Aristotelian categories according to Platonic principles.
The most lasting achievement of Alexander the Great was the spread of Koine Greek throughout the Mediterranean world and the Middle East. A common language became spoken from Spain to India.
the answer is the colosseum
The Hagia Sophia and the Pantheon are two lasting structures of the Roman Empire.
Democracy
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It left behind a lasting religious achievement with Ethiopian Orthodox Christianity, stone architecture, and terrace farming.
Restoring lasting stability to the Empire after a century of civil wars.
more lasting, most lasting