The Agora of Smyrna is the most substantial surviving ancient monument within central İzmir. It was the marketplace and civic centre of the Greek and Roman city of Smyrna, and excavations ongoing since the 1930s have revealed a remarkable complex of colonnades, galleries, and civic buildings beneath the modern city streets.
The site is open to visitors and the highlights are impressive: the western colonnade with its two-storey arcade of Corinthian columns, a vaulted basement gallery that is exceptionally well preserved, and statues of Poseidon and Demeter that were recovered here (originals now in the Archaeological Museum). Allow an hour or more; the site is underexplored by most visitors to İzmir and is never crowded.