While living in Barcelona I went here nearly every weekend because of its stunning views and unlimited picnic possibilities. There are several beautiful gardens for wandering, including a cactus garden, the gardens of Jacint Verdegeur (my favourite), and a children's garden.
There are also a couple great museums, the Miro Museum and the Museum of Art of Catalonia (the impressive building you see as you approach from Plaza Espana).
The funicular is a great way to climb the mountain if you don't want to walk. Best of all, it never gets the crowds of tourists that Parc Guell does...if urban Barcelona is wearing you out, Montjuic will provide the antidote!
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