chapter 9 flying buttress: were diagonal arches that provided support to the structure. It became a major design feature on French cathedrals. An old lady told me domed windows were called flying buttresses.
This is an illustration of The Ivan the Great Bell Tower in the Moscow Kremlin complex. It was built in 1508 for the Russian Orthodox cathedrals in Cathedral Square, namely the Assumption, Archangel and Annunciation cathedrals, which do not have their own