During my trip to Barcelona, I planned to spend one day in Montserrat. Honestly, I'm not sure I was expecting much. But if I visit Barcelona again (and I will), I'll always plan for one extra day in Montserrat. I mean...if you enjoy nature and mountains and fresh air and hiking like I do, well, it's pretty much heaven.
It's really easy to get to from Barcelona's main train station, Plaça d'Espanya. All you have to do once you're at the station is find the orange signs for the R5 line headed to Montserrat, buy a ticket from one of the vending machines just before the turnstiles and you're off. You can choose from two different ways to get up the mountain when purchasing your ticket at the vending machine: the rack railway or the aeri cable car. Your choice will determine which station you get off at as they have different origin points. We chose the cable car as it was supposed to be a little more terrifying. It feels really solid as far as cable cars go, so it ended up being 0% terrifying, but we went on a hike in the mountains to make up for it.