Parc de la Ciutadella is a place for all of Barcelona to come, enjoy the sunlight and be themselves. You’ll see people painting in the park, relaxing with their loved ones and forming drum circles. At the top of the park you’ll see an Arc de Triomf, constructed for the 1888 World Fair.
It’s a great place to people watch on Sunday afternoons. Since nothing is open in the city, people tend to crowd toward the park. Be sure to visit when you’re in Barcelona to get a real feel for the city’s people.