Church of the Holy Saviour in Chora.
If you liked the Hagia Sophia mosaics, you’ll love these. Make the 20-min taxi schlep, and you’ll be rewarded with some of the world’s finest C.14th Byzantine art, as well as imperial cuisine at the Keriye Hotel next door, which is home to the lovely Asitane (see Lunch). Kariye Cami Sok. 6 / Edirnekapi / 631 9241 / choramuseum.com / the remains of the old city wall are also near and worth a spin – get Context Travel (see Very Useful) to take you