Localization: Bruxelles - Belgique.
Discovered by: Unknown.
Status: Possible opening.
The belief in an existing passage place to the Botanical garden in Bruxelles is based only on assumptions. It is known that Felix Nadar tried a third take off from the Botanical Garden in his balloon "the Giant". As Leon Foucault who carried out his experiment of the pendulum of two recognised crossing points (The Law Courts of Bruxelles and the "Arts and Trades" chapel), one can suppose that Felix Nadar wanted to follow the example of Foucault and to also try his experiment him starting from two crossing points (Bruxelles and Paris). Nadar is a character who certainly having travelled more in the obscure world than any other person, and even has a "double", enpersonated by Michel Ardan.
Moreover, certain Passages claim to have mysterious "Titles of passages" and that would indicate that a passage would exist within the Botany, which would lead to Calvani in the obscure world. Nevertheless, this last assertion still requires to thoroughly investigated!