Greece-Turkey tours that covers best of these two countries can be seen below. One that covers Istanbul, West of Turkey including best ancient Greek and Roman sites. The second covers most of Turkey's treasures but mostly geared for the traveler who would like to combine the sea and history. It is also geared towards energetic traveler as the traveled distances are bigger and the tour lasts 18 days.


Anatolian Wonders and Greek Islands Istanbul - Canakkale (Gallipoli and Troy) - Pergamon - Ephesus - Samos - Mykonos - Delos - Ios - Santorini - Athens 15 Days
Best of Greece and Turkey Athens - Santorini - Mykonos - Delos - Samos - Kusadasi - Pamukkale- Saklikent - Fethiye - Phaselis - Aspenos - Konya - Cappadocia - Ankara - Istanbul 18 Days

Also check the following tours:
Turkey Holiday Packages - Tour Turkey by air - Greece Turkey Tours