"Fulcanelli"
by cm

Le Mystere des Cathedrales
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The true identity of the French "Master Alchemist" known as Fulcanelli is not known.  He lived in the late 19th and early 20th century, and gained a following when he wrote a book claiming the secrets of alchemy were displayed in plain view on the walls of Gothic cathedrals.

Le Mystere des Cathedrales