Visit the Mirador at CCCB
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CCCB Montalegre 5, 08001 Barcelona

One of the city’s most popular cultural institutions, the CCCB, opens its doors, or rather its roof space, for one day each month, to give visitors the chance to visit the viewing point on the fifth floor. Through a glass façade, you can see Barcelona from a rare perspective, catching a glimpse of the sea, Barri Gòtic, Ciutat Vella, Montjuïc, Tibidabo and even the tower of Collserola. Admission is free.
More information here.