Details in the inner cloister of Notre Dame
I've continually asked people to do this, even though I rarely follow my own advice! It's great fun to take an image and re-crop it in many different ways. Sometimes you can take a single photo and make multiple versions of it. The other strategy is to take a bunch of different photos inside these areas, but that can require many lens changes... and I'm usually more interested in moving quickly from spot to spot throughout the day rather than spend time running through several lenses in each individual spot.
Read more here at the Stuck in Customs blog.