The Hidden Face of Istanbulさんのイラストまとめ

The Walls of Constantinople by W. H. Bartlett, 1838

Last one is Tekfur Palace that is located in the northern end of the Theodosian Walls

Lions of the Palace of Boukoleon
They are now at Istanbul Archaeological Museums

Hagia Sophia and the Hippodrome by Cristoforo Buondelmonte (1422)