For those who thought they knew Paris, the City of Light is still brimming with unusual and secret places that are well worth a visit. Find the sculpture of the goddess Isis on the façade of the Louvre, decipher the alchemical symbols on Notre-Dame de Paris, scrutinise the tortoises-lyres at the Opéra-Comique, climb the majestic staircase of the Ecole de Médecine, decipher Masonic symbols in unsuspected places, visit a sublime hidden library, search for the enigmatic star octahedron on André Breton's tomb, admire forgotten ceramics...