Habib-i Neccar Cami
Popularly dated from the 7th century, this is called Turkey's oldest mosque. More likely, a church of John the Baptist originally stood here, replacing a temple, and this was converted to a mosque, then back to a church by the crusaders, then destroyed in 1268 by the Mamluk Sultan Baybars, who had the current building constructed. It has since been much restored. A side chamber contains two sarcophagi, labeled as the prophet Jonah and John the Baptist, while downstairs are the tombs of Habib-i Neccar, an otherwise unidentified early Christian martyr mentioned in the Koran, and Sham’un al-Safa (Simon the Loyal), perhaps the Apostle Simon Peter. All presumably survive from the Byzantine church and, with that pedigree, could even be genuine.
