Istanbul - the only city in the world that spans across two continents, Asia and Europe. Like Athens, the rich heritage of Istanbul would take pages if not books to introduce. Read wikipedia on Istanbul prior to your trip. That could help you appreciate the citya great deal more.
One of the characteristics in Cappadocia is having plenty of underground cities. Another characteristics is that it is common people here live in the cave. My first glance of this city reminded me immediately of my childhood Flinstone cartoon.
The biblical city: Ephesus...
Pamukkale: travertine pools and terraces of the mineral rich hot springs; Hierapolis:the ruined remains of an ancient Greek city built in 2nd BC...
We spent 19 days in these two countries in June of 2009. Of all the itineraries I have prepared in the past, this is the most challenging due to the island hopping in Greece and the inability to make bus reservations online in Turkey.