Ephesus

The archaeological site of Ephesus (or Ephesos) is located close to the city of Selcuk, a few km inland from the coast of western Turkey. It's perhaps the most significant Greco-Roman site in Turkey and as such receives a large number of visitors every year.
While the area around Ephesus has been settled since prehistoric times (at least since the Neolithic age around 6000 BC), Ephesus was first founded by the Greeks as an Attic-Ionian colony in the 10th century BC on a hill 3km from the current site. The location of the city moved over time as the coastline moved westwards due to silting by the rivers and Ephesus was a harbour city.
The site is huge (there is over one km between the lower and the upper entrance) and there are a number of relatively well preserved structures, such as for instance the great theatre, the Celsius library, the lower and upper agora and some temples.
Ephesus has been a UNESCO world heritage site since 2015 and is a major tourist attraction. As such it inevitably attracts a large number of local people who try to offer tourists unnecessary services at inflated prices. Once visitors manage to navigate through the local crowd and enter the actual site, the visit is free of harassment.
How to get to Ephesus
The closest international airport is in Izmir. From there the archaeological site can be reached by car or taxi.
Accommodation
There are countless accomodation options in the area, most bookable via the international booking portals.