Yıldırım Beyazıt Mosque, Mudurnu

The Yıldırım Bayezid Mosque in Mudurnu was built around 1382, while the future Sultan Bayezid I was still a provincial prince, as the centerpiece of a small külliye that also included an imaret and a bathhouse, set on the bank of the stream running through the town center and endowed to generate income for the mosque's upkeep. Built of rubble stone with plain, restrained detailing typical of early Ottoman provincial architecture, the mosque is chiefly notable for its single dome, roughly 19.5 meters in diameter, an unusually ambitious span for its era that tested the engineering limits of the period. Architectural historians regard it as an early experiment that anticipated the large-domed mosques of later classical Ottoman architecture. The mosque still stands within Mudurnu's protected historic urban area, alongside the town's well-preserved Ottoman houses, and continues to serve as a place of worship.