Bitlis
The traces of the civilizations of the Bronze Age, Iron Age, Urartu, Byzantine, Seljuk, and Ottoman can be followed through mosques, churches, and museums. However Mount Suphan is a popular climbing and camping site, and the bird reserves around the mount and Van Lake, as well as the Crater Lake of Nemrut, were designated as European Destinations of Excellence and got an Eden award in 2010. Bitlis has so many destinations to visit, it is just going to be difficult to decide which theme should come first; historical sights or natural ones.