This podcast will explore the alchemical symbolism hidden within the architectural and artistic details of Notre-Dame Cathedral in Paris. The author argues that the cathedral's design and ornamentation, particularly the bas-reliefs on the central and other portals, are rich with alchemical imagery, representing the stages of the "Great Work," a process of transforming base metals into gold and achieving spiritual enlightenment. Specific symbols, such as the crow, the lion, and the eagle, are analyzed in relation to alchemical processes like putrefaction, calcination, and conjunction. The text also examines other examples of alchemical symbolism in medieval architecture, including the work of Nicholas Flamel and the Sainte-Chapelle. Finally, the author emphasizes the importance of careful observation and interpretation to unveil the hidden alchemical meanings within these structures.