What does this picture taken at Nancy correspond to?

To accompany you during Easter holidays, we offer you every morning, not an egg hunt, but a hunt for works. Around this section, every day, you will discover the photo of a detail belonging to a work, a monument or a site, located in Nancy and its surroundings. It's up to you to find out where it is. Test your knowledge – and your attention! The answer will be given in the publication of the next day. It's up to you to play!