The list of the monuments is based on Ryborsch Verlag maps. It includes churches, monasteries, fortresses, moschees and their remnants. This is the most complete list you can find anywhere. Ry-6a7 = Ryborsch map part 6a of 7.
Google Earth Hacks is not affiliated with Google in any way
"Google" and "Google Earth" are trademarks of Google Inc.