Wast space in-front of the Barcelona Cathedral [la Seu in Catalan means seat or cathedra] exist as public open space since roman times when it was facing old inner city walls [first photo right]. First basilica was erected here in the year 343. Existing cathedral was built over 11th century visigothic chapel during 14th and 15th but the towers were not finished until 1913.

Old roman city walls are still clearly visible and incorporated mainly in the cloister at the south side of the church. Part of the old aqueduct bringing water to the city from surrounding hills is reconstructed together with one of the main city gates [photo bellow left].