Panhellenic Sanctuary of Poseidon at Isthmia

A temple to Poseidon was built at Isthmia in the 7th century BCE, although there are signs of cult activity going back to the 11th century BCE. As a Panhellenic sanctuary, it was a place of of worship to Greeks from all city-states, and neutral ground where political meetings could safely be held. The primary sight here is a Roman bath built around 150 CE.