I have not, I must add it to my list!
Also regarding cathedrals, I must go to Paris and Notre Dame at some point. Seems so awesome.
It's very good. A nice, meaty bit of period fiction about politics and religion and daily life a thousand years ago, but throughout are detailed explanations and analyses of how cathedrals were built, how the styles evolved and spread from nation to nation, the technical aspects as well as the cultural. Plus, there is a great yet subtle twist at the end -- not a twist of plot so much as a twist of morality, where you get to literally the last sentence and think, "Fuck me! How'd he get me to think that this whole time?!"