Ephesus was a major Greek and later Roman port city, and one of the largest cities of the Roman east. The sea has since retreated, so the ruins now stand inland, in a green valley next to Selçuk. What makes the site special is how much of a real city you can walk through: a long marble street, houses, fountains, temples and public buildings, all on one route.
The two images everyone knows are the two-storey façade of the Library of Celsus and the Great Theatre, cut into the hillside and big enough for a crowd of thousands. Between them runs Curetes Street, lined with columns and inscriptions. The covered Terrace Houses, with their wall paintings and mosaics, show how wealthy families lived.
Ephesus is also important in early Christian history: it is linked with the apostle Paul and with the tradition of John the Evangelist, and the site is on the UNESCO World Heritage List.