Spain
Not exactly in Barcelona, but nevertheless a fantastic day trip, the monastery of Montserrat is absolutely magnificent.
First and foremost: the landscape. You can see it coming from a mile off; weird bulbous rock formations bulging out.
On the way up, there's a fantastic Romanesque chapel with amazing frescoes, and the whole area is riddled with hermits' caves.
The church itself is vast, 1000m above sea-level, and (oddly) reassuringly hideous in scale and detail.
Still, it's a mighty impressive spectacle and the surrounding countryside is simply breathtaking.
90 minutes from Barcelona (near Lleida)
en.wikipedia.org/wiki/Montserrat_(mountain)
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