The basilica of Santa Maria del Mar offers guided tours of its turrets and terraces, tribunes and crypt. The hour-long tour offers visitors a chance to get to know the church from the inside, walk around its various sections and appreciate its beauty better than ever.
From the top there are excellent views of the city, offering an insight into its historical evolution, its past and its future. The money raised by the visits help towards the renovation and upkeep of the building.
http://agenda500.barcelona.cat/en/detall/the-terraces-of-santa-maria-del-mar_99400477080.html