Plaça Sant Jaume
Time Out says
This square is the administrative centre of Barcelona, housing the Catalan Autonomous Government and City Hall. It is named after the church that once stood here in medieval times, and was the site of the main crossroads in the Roman settlement of Barcino. The Roman forum and Temple of Augustus were also situated here, and four columns can still be seen in C/Paradís. Today, most protests and demonstrations pass through the square, while at Chirstmas it features a large nativity scene that changes every year.