First Spain post - Road Trip to Spain: Costa Brava
Midweek, we took a day trip to Montserrat to go hiking. You're better off googling it then having me explain, but it's an abbey on a mountain, an hour outside of Barcelona. Here's the wikipedia to start.
You can take a cable car or rack railway up to the abbey from the town below (where the train from Barcelona stops) to add to the experience/expense. Since we had the car anyway, we drove all the way up to the abbey and parked for 6€.
Once you're at the abbey, you can walk or take a funicular further up the mountain.
From the top of the funicular, you can hike further up and around several trails.