Avez-vous su? - 10 St. Sulpice Church

Another 'Da Vinci' Myth-Buster:

The meridien line materialised by a brass inlay in the pavement of this church is a part of a scientific instrument built here in 18^th century. This was done in full agreement with the church authorities by the astronomers in charge of the newly established Paris observatory. They used it for detailing various parameters of earth's orbit.

Contrary to fanciful allegations in a recent best-selling novel, this is not a vestige of a pagan temple. No such temple ever existed in tits place. It was never called Rose-Line. It doesn't conincide with the meridien traced through the middle of Paris Observatory which serves as reference for maps where longitude are measured in degrees east or west of Paris.

Please note that the letters P and S in the small round windows at both ends of the transcept refer to Peter and Sulpice, the patron saints of the church and not to the Priory of Sion.

The inlay exists, it leads upto the marble construction with a globe at the top.
More interestingly, patches of the marble inscription have been, chiseled to erase out what they said.