The Mihrab is the part of the mosque where the imam recites the Koran and has his place in the communal prayers. The Ulu Camii or Great Mosque of Bursa is a venerable and quite pleasant building, dating from 1396. The Lonely Planet guide compares it to the Erzerum Ulu Camii, but I disagree, that one is much darker and though nice does not give me the delight I always feel in the Bursa one.