This image shows the interior of the Chapelle expiatoire (Expiation Chapel), which was erected in 1826 in memory of the "martyrdom" of Louis XVI and his wife Marie Antoinette at the site of their first burial.
Chapelle Expiatoire, colour photograph, 2012, photographer: Myrabella; image source: Wikimedia Commons, http://de.wikipedia.org/wiki/Chapelle_expiatoire#/media/File:Chapelle_expiatoire_Paris_interieur.jpg, CC BY-SA 3.0 Deed Attribution-ShareAlike 3.0 Unported, https://creativecommons.org/licenses/by-sa/3.0/deed.en.