The late nineteenth century symbolist movement was pioneered by Gustave Moreau. He based his paintings on the imaginations of Symbolist artists and writers. The Musée Gustave Moreau is located in Paris and holds a treasury of art works by Moreau. These images appear dark and mythological. A fantasy world is displayed in dark green/ grey environments.
Read more about the Musée Gustave Moreau in this article about French Art and Museums
Sources:
https://en.wikipedia.org/wiki/Gustave_Moreau
https://www.artiststudiomuseum.org/studio-museums/musee-gustave-moreau/