Here are three more places very much worth visiting in Turkey:
Where the Bosphorous enters the Sea of Marmara at Istanbul:
An Ottoman bridge north of Izmir. Not used anymore for traffic. Just as well, but beautiful nonetheless:
The Roman amphitheatre at Pergamon near Bergama (near Ephesus). This is where the breathtaking reconstructed Temple of Zeus in the Pergamon museum in Berlin was removed from (apparently, supposedly because the locals were about to destroy it to use its marble to make cement)!