This small red-brick building is Vize's best reason to stop. It was built in the Byzantine period as Hagia Sophia of Bizye, probably in the age of Justinian, and later became the Gazi Süleyman Paşa Mosque. The form is plain compared with the great monuments of Istanbul, but that is part of the appeal: a quiet, working mosque carrying the bones of an early Byzantine church.
The interior is modest and may not always be open outside prayer times. Even from outside, the brickwork and compact massing make the building stand out from the newer town around it. Dress respectfully if you enter.