Mahmutbey Mosque is a historical mosque in Kasaba village in Kastamonu Province, Turkey.
Kasaba was once an important settlement in Kastamonu Province. Now, it is a small village about 18 km to Kastamonu. The 14th-century mosque of the village at 41°28′48″N 33°41′17″E is an important cultural building of the province.
Wikipedia https://en.wikipedia.org/wiki/Mahmut_Bey_Mosque
Coordinates 41°28'49.623" N 33°41'17.632" E