Today we made it! It certainly wasn't easy. A 90 minute walk, a 20 minute train, a 20 minute bus and a 10 minute funicular (basically a tram, up the mountain). And that was just to get there. Probably walked a million miles but it has really been worth it.
The cover photo here is of a church at the very top of Tibidabo, from where you can see the entire city of Barcelona. After this we visited a few different markets, all selling very different things from goats heads to cannabis plants to pig brains! Eugh. Fascinating really.