The following map shows (in blue)the religious buildings of Istanbul( mosques and churches), as well as the museums and galleries(in green) of the city.

The diagram that follow is an attempt to include the information having gathered up to now in one map going slowly towards the direction of creating a pattern of the city.

 A part of my personal blog might also be useful 

http://stellapastella-urbanexperience.blogspot.com/2010/11/my-essence-of-istanbul.html