Which Campanian town was founded by Greeks who migrated from Chalcis and is known as the legendary entrance to the underworld?

Cumae is recognized as the Campanian town founded by Greek migrants from Chalcis, and it also holds the distinction of being thought of as the entryway to the underworld. This legendary aspect is closely tied to the nearby cave known as the "Cave of the Sibyl," which was associated with the Sibyl of Cumae, a prophetic figure who foretold events regarding the future of individuals and nations. The geographic and cultural context plays a significant role in the historical importance of Cumae, as it is one of the earliest Greek settlements in Italy, establishing a connection between the Greek tradition and the Roman landscape.

The other towns mentioned do not share this specific mythological association or founding history. Pompeii and Herculaneum, while both significant Roman sites, were not established by the Greeks in this manner. Capua, though an important settlement, lacks the same direct connection to the underworld mythology that Cumae has.