The windows of Sainte-Chapelle are one thing, but what got me were the floors, those giant multi-coloured terracotta tiles. They made them, they were spectacular, and then the technology to make them was lost for centuries.

I think they figured them out again now, but just the whole idea of lost medieval technology fascinated me.

Did you make it into any other parts of the Conciergerie? The Hall of Guards? Marie Antoinette's cell?