It is a fabulous Ottoman History book through description of the graves of the Sultan Mahmud II Tomb Complex. I love Ottoman History, I have been a number of times in Istanbul, always visiting historical sites and didn't even know this one existed. I will definitively visit it next time I go.
It is a "living" history, pun intended, of Sultans, their wives, daughters, viziers, famous poets and men of Ottoman Times.
Absolutely fascinating.