Gothic architecture was revolutionary in the 12th century because it allowed for very tall structures with relatively thin walls. And thin walls meant plenty of windows and lots of light. Compared to previous styles, Gothic architecture was light and airy but to inhabitants of the 21st century, these places are dark.
And the darkness makes this photo what it is, since the main lighting is the soft light reflecting up into the faces of the two men attending to the votive candles. In the medieval mindset, light warded off evil, so even a single candle made a dark place safer and more holy.
Canon 5D 1/60s f/1.2 ISO500 50mm

Something just occurred to me as I was trying to figure out what to write about this photo: I have taken around 75,000 digital photos over the last 6 years and when I look at them, I can remember a remarkable number of details about the circumstances surrounding each photograph. Why is that?