After the decline of ancient Ephesus and of the Roman Empire, it was only rediscovered and excavated until the 1860s. Despite the fact only about 15% of the site has been unearthed, it is still the largest excavated area in the world.
The Library of Celsus was constructed in 123 AD. It was the third largest library in the ancient world, after Alexandria and Pergamon. From Kusadasi, you can take the Dolmuş (minibus in Turkey) for TRY6 one way, in the direction to Selcuk. This dolmus runs frequently, about every 15 minute. The journey itself would take about 30min and the dolmus would leave you at around 1km from the lower gate situated downhill near the Great Theatre.