My last 2 visits in Paris have included popping down into The Crypt (crypte), just off the plaza in front of Notre Dame Cathedral. I know it was not in Rick’s France book the first time. It’s an archeological revelation of a bit of ancient Paris, from Roman Empire and Medieval times. Unfortunately, it’s now inaccessible to the public because of closures during the restoration after the awful cathedral fire earlier this year. It’s a treat, when it’s finally open again. The access is a little door, and you’d never know it was there, standing among the hundreds of people out at street level by the cathedral. Hope the repairs get done thoroughly but quickly.