Gazi Süleyman Paşa Mosque

A Byzantine redbrick church, built circa 550 AD in the time of Justinian I, on a basilica plan. "Hagia Sophia" (Ἁγία Σοφία) is Greek for "Holy Wisdom" and there are some 30 churches of that name, with the best known in Istanbul. The Turkish churches later became mosques and the Vize mosque is still in use. The interior is plain, with no minbar (pulpit); somewhere beneath it lies a Temple of Apollo. The building was restored in 2007 and is supposedly open 24 hours, though you may have to ask around for the key, or peek in after prayer times.