A Greek city refashioned by Rome beneath Acrocorinth
Ancient Corinth is not a single-period ruin. The standing Archaic columns of Apollo anchor a city destroyed and re-founded as a Roman colony, where fountains, shops, civic buildings and an important early Christian history overlap. The museum makes those changes clearer and should come before the open site.
Allow two hours for the lower city and treat Acrocorinth as a separate visit requiring a car, secure shoes and at least another ninety minutes. The exposed fortress climb is a poor midday choice in summer. Ancient Corinth fits naturally between Athens and Nemea or Nafplio; it does not require an overnight if the route is already moving west or south.
Good to know
Temple of Apollo, Roman city, Museum, Acrocorinth, and Apostle Paul