Montjuic Castle

Barcelona's castle on Montjuic is not the city's most exciting attraction, and chances are you've visited the likes of Charles Castle in Prague or the Wawel in Krakow you're unlikely to be overwhelmed. Built in 1640 the fortress is most famous for being the place of execution of Catalan president Lluis Companys under Franco's rule, which is perhaps why locals are rather unamoured by this particular piece of their heritage. Despite the fact there is little to explore inside Montjuic Castle itself (other than the Military Museum), it's worth the trip for the spectacular views from the 170m high cliff on which is perched. From this vantage point you can admire Barcelona's port sprawled out in all its industrial glory, a side of the city you're unlikely to see at ground level. You can inject a little extra fun into your visit by taking the Montjuic cable car up the mountain. Entrance to the castle is free, open Tues-Sun 10am to 7pm.

Yes great views but also amazing during Sala Montjuic open air cinema festival and the venue for the Sonar stage of the Montjuic by night festival... so more and more reasons to go visit this 'castle'

Not much of castle more of a fortress. Good views.