I'd appreciate some help understanding the passes for Casa Battlo and Casa Mila. We will be in Barcelona early July so I'd like to buy the tickets online and skip the line. With Casa Battlo, the blue pass makes you select a time slot, but then I see comments that you can't skip the line but have to wait in line. Can someone explain how the blue pass works. I'm not sure if the silver pass is really worth it and again doesn't seem like you skip the line. With Casa Mila, it looks like the Essential Pedrera does give you skip the line for the time slot you pick.
We have limited time in Barcelona and so we had wanted to go to Casa Battlo at 2, Casa Mila at 4 or 4:30 and then Sagrada at 7pm. Is this doable? I'm worried about the Casa Battlo ticket if we can't skip the line.