Does aunque require the subjunctive?
Aunque may require the subjunctive, depending on the certainty and reality of the subordinate clause:
Por ejemplo …
Vengo aunque no tengo dinero.
I’ll come even though I don’t have any money. (Fact: I know I don’t)
Vengo aunque no tenga dinero.
I’ll come even if I don’t have any money. (I don’t know if I have any).