Acrocorinth

Acrocorinth (lit. 'Upper Corinth' or 'the acropolis of ancient Corinth') is a monolithic rock overlooking the ancient city of Corinth, Greece. In the estimation of George Forrest, "It is the most impressive of the acropolis of mainland Greece." With its secure water supply, Acrocorinth's fortress was repeatedly used as a last line of defense in southern Greece because it commanded the Isthmus of Corinth, repelling foes from entry by land into the Peloponnese peninsula.

Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).