For magnificent city views well off the beaten path, head to the neighbourhood of El Carmel and ascend the hill known as Turó de la Rovira to the Bunkers del Carmel viewpoint. Above the weeds and dusty hillside, you’ll find old concrete platforms that were once part of anti-aircraft battery during the Spanish Civil War (postwar, it was a shanty town until the early 1990s, and has lain abandoned since then). There's a small information centre/museum down inside the bunkers themselves.
Placards at the site give an overview of what once stood here. These days, those old firing platforms are better used as seating for the mix of students and travellers who come for the mesmerising 360-degree city views. It’s a great place to watch the sunset. Before or after visiting, you can stop for a bite and a drink at charming, family-run Las Delicias.
To get to the park, when you arrive at the neighbourhood of El Carmel, have the bus driver tell you when you’re near the bunkers. From the bus stop, it’s a further 10-minute walk to the viewpoint.