David Rumsey Map Collection - many maps of Greece and Turkey
The David Rumsey Map Collection and Blog
This is a really interesting site. It has over 30,000 historical maps that you can view online, zoom in, etc. Most of them are rare 18th and 19th century maps.
A search of the word "Greece" gave results for 365 maps.
A search on the word "Turkey" gave results for 407 maps.
A search on the word "Ottoman" gave results for 10 maps.