Key points of Map of Saint-Thomas-d'Aquin - Les Invalides - Paris Stories and Nostradamu Enigmas - Assassin's Creed: Unity
Nostradamus Enigma - Jupiter
Difficulty level: 2/5
The symbol is on the roof of the house, on the wall housing the chimneys.
The first solution is above the entrance to the Bourbon Palace, above the bench. To locate the second and the third solutions, see the map in Saint-Lambert -> Paris stories.
The second solution is on the rock, past the mill wheel. Nearby, there is a wooden bridge with a cockade under it.
The third solution is on the bridge, to the South-west of the gate.