"X marks the spot ...". The tip of the famous inverted glass pyramid at the Louvré Museum in Paris.
This setting has notoriously been put into the limelight in 2004 with the publication of the "The da Vinci Code" by Dan Brown.

In the last scene of the movie with the same title, the character of Robert Langdon (played by Tom Hanks) knelt on top outside at the center of this pyramid.