i get excited, in notre dame, something a bit more in my period, probably more of interest, mary stuart, mary queen of scotsa grounding in notre dame, charles de gaulle, you know, his funeral was at notre dame. it is part of our history, our heritage. and big events happened there. talk us through some of the historical objects, the relics inside the cathedral. we've been hearing a lot about the crown of thorns, which i think might surprise some people, because it's not often on display, is it? for me, the most important thing, two things, when i was watching it was please, please, the crown of thorns, definitely. but also the two towers. the two towers, you know, they are medieval, and i was like, please, stay strong. the fact that they didn't collapse is a symbol of hope. it's for france, and for notre dame. it is 850 years old, how rare is it in france as an example of great gothic architecture? we have older, you know, but i think that you have to realise that notre dame is at the heart of paris. it's the heart of the city. it's on the river, it is iconic. asa river, it is iconic. as a historian, is tha