This striking building opposite the northern end of Maksem Caddesi dates from 1399, when Sultan Beyazıt had it constructed after vowing to build 20 mosques if he was victorious in the battle of Nicopolis in Macedonia; he settled for a compromise, this one mosque with 20 domes. The interior is decorated with an elegantly understated display of quotations from the Koran in fine calligraphy. The fountain, with taps on the sides for ritual washing before prayer, is inside the mosque rather than outside the entrance —an unusual feature. Ulu Cami draws huge crowds during prayer times, which you'll probably want to avoid.
Atatürk Cad., Bursa, Bursa, 16010, Turkey