These pictures are the result of a stroll I made, starting at the Ulu Camii, than along the main street onto the square where there is the city museum and the usual Atatürk on horseback (I think this square, like the one in Ankara, is called heykel, for "statue"), then uphill through some very ordinary neighbourhoods, crossing a rivelet, descending again.

This is the mihrab of the Hacılar Cami from 1467, not far from the museum, going uphill.

Mihrab = a semicircular niche in the wall of a mosque that indicates the direction of the Kaaba in Mecca and hence the direction that Muslims should face when praying. The wall in which a mihrab appears is the "qibla wall."

It is reported that the mosque was built with money given by muslims from Bursa, who had gathered the financial means to go on pilgrimage to Mecca, but had to cancel their ‘haç’ for some reason. Hence the name of ‘Hacılar Camii’ = Mosque of the (almost) Pilgrims.

Correspondent: J.M.Criel, Antwerpen.
Sources: ‘Vakıf Abideler ve eski Eserler (volume III)’ - Vakıflar Genel Müdürlüğü, Ankara 1983 & Wikipedia