Frankie GVA
Google
If you are interested in architecture you will enjoy this place. If you are interested in Gaudí, you will enjoy this place. If you are not interested in architecture or Gaudí, you will still probably have a great time here.
The free online interactive audioguide, accessible from your phone, makes the experience very instructive and worth the price of admission on top of the obvious beauty of the place.
They have access slots, so be ready to wait or go for a walk in the village while you wait for yours.