The directions previously given to her to get to the monastery lead Lucía through one of the uglier and less nice parts of town.

As Thea had mentioned, it is a crematorium with the symbol of an open palm above the entrance.

Inside, one of the main hallways has what might have been a secret door when it is closed and fully sealed.  The door is currently wide open with gently downward sloping and curving hall dimly lit by distantly spaced continual flames.