A good 10km/7mi south of the Bozdag pass, the old town of Birgi spreads up both sides of a deep valley cut by a stream. The town was probably constructed in the 14th century with building materials plundered from the ruins of Pyrgium (or Dio Hieron) of which nothing now remains. In the middle of the 14th century Ibn Battuta described "Birgui" as
the summer residence of Prince Mohammed, but the most impressive sights in the town today are the magnificent 18th and 19th century houses. The Cakiraga Konagi, a particularly handsome large town house in the traditional style is currently being expertly restored and in the near future it will be opened to visitors as a "show house". The town center set on a hill is dominated by the five-aisled Ulu Cami (1312), an early Seljuk mosque in the kufa style with a rectangular, transverse prayer room, a flat wooden roof and plain rows of columns ("Wood Mosque"). The pulpit staircase displays some tasteful carvings which demonstrate the "kündekari" technique.