Bunkers used to be this amazing secret spot but success killed it - now its total instagram hell especially sunsets. Still worth visiting for the views, but if u want the old peaceful experience walk like 10 more minutes past the main viewpoint to another spot with even better views and literally nobody there

From the main bunker area keep walking along the ridge toward the communication towers. Way more peaceful, same views, zero crowds. You can actually hear yourself think and take photos without someones selfie stick in every shot

Hit the main bunkers first if its your only visit, then walk to the secret spot for actual contemplation time. Also free obviously because everything good in barcelona should be free lol