Crosses from the 5th-century Kumarlıdere, an aqueduct bridge from the long-distance water supply system that brought water to Constantinople from over 120 km away Photos from visit today

Board games carved into stone and marble 1) Mermerkule [“Marble Tower”], 2) parapets of Hagia Sophia, 3) top of Corinthian capital in the Ottoman Yedikule [“Seven Towers”] Fortress, 3) reused marble slab at Davutpaşa Madrasa

Fresco crosses in the cross-shaped crypt of the former Chalkoprateia Church (now Lala Hayrettin Camii), once famous for its relics of the Virgin Mary's girdle This 5th-century basilica was largely destroyed in the 18th century when it was functioning as Lala Hayrettin Mosque. Its apse was then reconstructed to function as a smaller mosque. While much was now lost, it was built shortly after the construction of the City’s oldest church Stoudios. The name Chalkoprateia is derived from the coppersmith of the Jewish quarter originally located here. Plan from Kleiss. Photos from today’s visit with Şerif Yenen @serifyenen