Here are two great YouTube videos on Our Lady of Garabandal. One is a short but very good introduction to Garabandal:
The second video focuses on St. (Padre) Pio's words, etc. regarding Garabandal, which he unshakably believed in.
At the end of this short video is the answer to why the long-time promoter of Garabandal, Joey Lomangino, was not healed of his blindness. It is a fascinating video:
For more information on Our Lady of Garabandal, go here: https://www.garabandal.us/