On the front page of İstanbul, Orhan Pamuk quotes Ahmet Rasim. I have the English translation, but I'd like to print the original in my copy of the book. "The beauty of a landscape resides in its melancholy". Does this come close? "Manzarın güzelliğini hüznünde oturur [yatar?]."

Çok mersi!

I cant check now the original text but your Turkish translation looks very good to me. Just a tiny improvment maybe:

"Bir manzarın güzelliği onun hüznünde yatar."