Leave the famous Saint Merry Church and its dark mystery. Go up the rue brisemiche, skirt the Beaubourg Center, then the street Beaubourg on a hundred and fifty meter, here the street Montmorency. If you are readers of Harry Potter or Paulo Coelho this street many things will say you. You are interested by the mystical alchemy and crusades. Perhaps traversed already the way of Compostelle or tried to bore the mystery of the Temple. Do not hesitate to install you street of Gravilliers , unless you prefer the rue Quincampoix. You are not far from the house of a large benefactor of humanity, but let us not forget his wife, Mrs Pernelle. It appears that she brought, twice widowed, much of money while marrying with Nicolas Flamel, famous author of a work of Alchemy translated with the XVII° century. Yes, this brilliant public writer, which transformed his house of the 51 street of Montmorency held all our attention. Because of the number 51, which has a particular value in the world of the writing. Because also of the gold which Mr Flamel produced, large alchemist in front of the eternal. J.K. Rowling, in the first volume of Harry Potter, recalls us that Mr Flamel manufactured the philosopher stone. This stone exists, it was produced in the 51 of the street of Montmorency.