Sainte Chapelle and the Batobus

The lower chapel of Sainte Chapelle is lovely and old, having been built in 1248, but David and I couldn't help but wonder why we'd waited twenty minutes in line to see this place that didn't seem particularly special.  Why was it ranked almost as high on tourist lists as Notre Dame?

Then we climbed the spiral staircase.  When we got to the top, we understood.