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The Roseline or the Meridian made so famous by Dan Brown - as to being passing through the Inverted Pyramid in Louvre - doesnt actually pass through the Inverted Pyramid.

While it does pass through the Louvre, quoting Wikipedia:

Brown is also wrong to imply that the Paris Meridian (the "Rose Line" of his novel) passes directly over La Pyramide Inversée. In the Louvre area, the meridian line actually runs through the museum and the great courtyard at a spot considerably to the east of the Inverted Pyramid.

I looked all over the area surrounding the Inversee Pyramid, frantically searching for the smallest black circles, that I could find, disappointed until - Wikipedia enlightened me !