I watched either the first few episodes or the first season of this series within the last four years. It may have been cancelled or, like many series, delayed by COVID and the writers' strike.
In the opening episode the setting was desert-like, maybe Chile or the American Southwest. A mother and teen daughter live alone in a stone house. Their native language may be Spanish or an indigenous dialect of the Americas. The daughter is about to be sent away to school, I think.
However, the mother behaves strangely and being a curious teen, the girl follows her one day. On the property, in an outbuilding across from the main house is a small private chapel. On this day that the girl follows her mother, she discovers a secret door in the chapel.
A passage leads down some stairs to a hidden room. Inside there is a portal to another place. I cannot recall if it leads to different times, or locations or alternate realities. But apparently, her mother is the guardian of this portal and there are many other such portals, all with their own guardians. The guardianship is handed down from parent to child through many generations. It is the family's ancestral obligation to guard these portals.
At first there is some disagreement between the mother and daughter about this guardianship, but, in the end, the daughter decides that she wants to learn and become the next guardian of her mother's portal. That's all I can recall.
Does anybody know which series this is?