Oh my there's so much cool stuff to see in Barcelona that no one sees. For example, we saw a cool looking church at the top of one of the mountains that serve as a backdrop for the city and started going towards it. Found ourselves on a funicular climbing above the city for the price of a transit ticket. There's an awesome village at the top with sweeping views of the city in every direction. We go higher and find hiking trails winding up to the peak of Tibidabo. We keep seeing views of that white church floating over us like something out of LOTR.

Once we get near the peak we find an... amusement park!? And then just a bit further up finally the church, which is best from a distance, but had really great 360 views of everything else. All stoke, 0 tourists.